Pratique du Shadowing: Why Are Elements Arranged This Way? | LESSON 4-The Periodic Table | Science in English - Apprendre l'anglais à l'oral avec la vidéo
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85 phrases
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Why are elements arranged this way?
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Take a look at the periodic table.
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There are many chemical elements, but they are not arranged randomly.
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Look at the horizontal rows, and then look at the vertical columns.
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What do you notice?
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Can you see a pattern?
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Let's find out why elements are arranged this way.
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Welcome to lesson four, an overview of the periodic table.
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In this lesson, we'll learn how chemical elements are arranged.
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We'll also explore element squares, periods, and groups.
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Finally, we'll use the periodic table to identify metals, non -metals, and noble gases.
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Alright, let's get started.
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First, let's look at our learning objectives.
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By the end of this lesson, you should be able to do three things.
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First, describe the principles tables used to arrange chemical elements.
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Second, identify information in an element square, and explain periods and groups.
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Third, use the periodic table to identify metals, nonmetals, and noble gases.
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Keep these objectives in mind as we go through the lesson.
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Now, let's begin.
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How are elements arranged?
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Let's take a closer look at the periodic table.
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The first principle is that elements are arranged in order of increasing nuclear charge.
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Next, let's look at periods.
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Elements in the same period have the same number of electron shells.
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Now, what about groups?
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Elements in the same group A have similar chemical properties.
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Notice the pattern.
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The periodic table helps us understand the relationships between elements.
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Now, let's look at an element square.
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Take a look at the element square for oxygen.
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At the top, we can see the atomic number.
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It is 8.
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The chemical symbol is O, and the element name name is oxygen.
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The atomic mass shown here is 16.
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So, one element square gives us several important pieces of information.
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Can you point to the atomic number?
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What about the chemical symbol?
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Can you find the element name and the atomic mass?
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Good job!
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Now, let's look at periods and groups.
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Let's start with periods.
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A period is a horizontal row in the periodic table.
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The period number tells us the number of electron shells in an atom of an element in that period.
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Now let's look at groups.
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A group is a vertical column.
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For the group A elements studied in this lesson, the group number corresponds to the number of electrons in the outermost shell.
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Take a look at the diagram.
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Can you identify a period?
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Now, can you identify a group?
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Excellent.
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Let's move on to the different categories of elements.
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The periodic table helps us identify different categories of elements.
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First, let's look at metals.
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Examples include iron, copper, and aluminium.
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Next, we have nonmetals.
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Examples include oxygen, sulfur, and chlorine.
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Finally, let's look at noble gases.
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These include helium, neon, and argon.
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Notice that these categories occupy different regions of the periodic table.
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Now, let's use the table to classify some elements.
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Alright, it's your turn.
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Take a look at these symbols, F -E -O -N -E -C -U -C -L and H -E.
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First, find each element on the periodic table.
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Next, identify its period and group.
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Then, classify it as a metal, a non -metal, or a noble gas.
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Now, work with a partner and explain your answers.
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Remember, don't just give the answer.
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Explain how you used the periodic table.
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Excellent work.
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Let's review the key ideas.
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Finally, let's review what we've learned today.
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First, elements are arranged in order of increasing nuclear charge.
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Second, the periodic table has periods and groups.
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A period is a horizontal row.
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and a group is a vertical column.
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Elements in the same period have the same number of electron shells.
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Elements in the same group A have similar chemical properties.
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Finally, we can use the periodic table to identify metals, nonmetals, and noble gases.
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Before we finish, think about this question.
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Why do elements in the same group have similar chemical properties?
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Think about the electrons in the outermost shell.
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Remember, the periodic table is more than a list of elements.
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It helps us understand patterns and relationships between them.
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Great job today.
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Keep practicing your science English, and I'll see you in the next lesson.
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale s’appuie sur la vidéo « Why Are Elements Arranged This Way? ». Les mots qui reviennent le plus souvent : element, table, periodic, period, identify. Cette vidéo contient 85 phrases et 697 mots à répéter en shadowing. La partie parlée dure 5:41. Le locuteur parle à un rythme régulier d’environ 123 mots par minute, confortable pour le shadowing. Seuls 77 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
15 mots de la vidéo à retenir, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| element nom | /ˈɛləmənt/ | élément |
| periodic adjectif | /ˌpɪɹiˈɑdɪk/ | périodique |
| arrange verbe | /əˈɹeɪnd͡ʒ/ | arranger, organiser |
| lesson nom | /ˈlɛs.ən/ | leçon |
| shell nom | /ʃɛl/ | coquille, coquillage |
| noble adjectif | /ˈnoʊbəl/ | noble, aristocratique |
| atomic adjectif | /əˈtɑː.mɪk/ | atomique |
| symbol nom | /ˈsɪmbəl/ | symbole |
| oxygen nom | /ˈɑksɪd͡ʒən/ | oxygène |
| vertical adjectif | /ˈvɝ.tɪ.kəl/ | vertical |
| horizontal adjectif | /ˌhoɹəˈzɑn.təl/ | horizontal |
| electron nom | /ɪˈlɛk.tɹɑn/ | électron |
| objective nom | /ɒbˈd͡ʒɛk.tɪv/ | objectif, but |
| principle nom | /ˈpɹɪn.sɪ.pəl/ | principe |
| column nom | /ˈkɒləm/ | colonne |
Les verbes à particule que vous entendrez
| Mot | Sens |
|---|---|
| find out verbe | découvrir, savoir |
| go through verbe | traverser |
Des phrases à répéter
Des phrases courtes et complètes de la vidéo, à réutiliser dans la conversation de tous les jours :
- What do you notice?
- Can you see a pattern?
- Let's find out why elements are arranged this way.
- Can you point to the atomic number?
- Can you identify a period?
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | are not arranged · are arranged |
| Futur avec « will » will + verbe — une décision, une promesse ou une prédiction | we'll learn · We'll also explore · we'll use |
Prononciation à surveiller
Le locuteur utilise 6 contractions et formes réduites, comme we'll, don't, I'll. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Mots longs — placez bien l’accent: periodic /ˌpɪɹiˈɑdɪk/, horizontal /ˌhoɹəˈzɑn.təl/, aluminium /ˌæl.(j)uˈmɪn.i.əm/
Les sons difficiles pour les francophones :
- /h/ — il se souffle, il n’est pas muet: horizontal /ˌhoɹəˈzɑn.təl/, helium /ˈhiː.li.əm/
- /tʃ/ et /dʒ/ — à ne pas adoucir en « ch » et « j »: arrange /əˈɹeɪnd͡ʒ/, oxygen /ˈɑksɪd͡ʒən/, objective /ɒbˈd͡ʒɛk.tɪv/
- /r/ anglais — langue recourbée, sans frotter la gorge: periodic /ˌpɪɹiˈɑdɪk/, arrange /əˈɹeɪnd͡ʒ/, horizontal /ˌhoɹəˈzɑn.təl/, electron /ɪˈlɛk.tɹɑn/, principle /ˈpɹɪn.sɪ.pəl/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Répétez phrase par phrase à vitesse normale, en reprenant chacune jusqu’à ce que votre rythme corresponde à celui du locuteur.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme element, periodic, arrange.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.