シャドーイング練習: Why Are Elements Arranged This Way? | LESSON 4-The Periodic Table | Science in English - 動画で英語スピーキングを学ぶ

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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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このレッスンの語彙とスピーキングのポイント

このスピーキングレッスンは、動画「Why Are Elements Arranged This Way?」を教材にしています。 繰り返し出てくる語は次のとおりです：element, table, periodic, period, identify。 この動画には、シャドーイング用の文が85文、単語が697語あります。 音声の長さは5:41です。 話す速さは1分あたり約123語で安定しており、シャドーイングしやすいペースです。 英語の頻出3,000語に含まれる単語は77%だけなので、語彙は難しめです。

この動画の重要語彙

動画に出てくる覚えておきたい単語15語を、発音と意味つきで紹介します。

単語発音意味
element 名詞/ˈɛləmənt/要素, エレメント
periodic 形容詞/ˌpɪɹiˈɑdɪk/周期的
arrange 動詞/əˈɹeɪnd͡ʒ/整える, 並べる
lesson 名詞/ˈlɛs.ən/授業, 学科
shell 名詞/ʃɛl/殻, 貝殻
noble 形容詞/ˈnoʊbəl/偉い, 立派な
atomic 形容詞/əˈtɑː.mɪk/原子の
symbol 名詞/ˈsɪmbəl/記号, 符号
oxygen 名詞/ˈɑksɪd͡ʒən/酸素
vertical 形容詞/ˈvɝ.tɪ.kəl/垂直の, 縦の
horizontal 形容詞/ˌhoɹəˈzɑn.təl/水平な, 横の
electron 名詞/ɪˈlɛk.tɹɑn/電子
objective 名詞/ɒbˈd͡ʒɛk.tɪv/目標, 目的
principle 名詞/ˈpɹɪn.sɪ.pəl/原理, 原則
column 名詞/ˈkɒləm/柱

動画に出てくる句動詞

単語意味
find out 動詞見出す, 調べる

繰り返し練習したい文

動画に出てくる短く完結した文です。日常会話でそのまま使えます。

  • 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?

この動画の文法

話し手がよく使っている文型を、動画の実際の表現とともに紹介します。

文型動画での表現
受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てるare not arranged · are arranged
「will」の未来表現 will + 動詞 — その場の決定、約束、予測we'll learn · We'll also explore · we'll use

注意したい発音

話し手はwe'll, don't, I'llなど、短縮形や弱形を6回使っています。聞こえたとおりの短い形で発音しましょう。

  • 長い単語（アクセントの位置に注意）: periodic /ˌpɪɹiˈɑdɪk/, horizontal /ˌhoɹəˈzɑn.təl/, aluminium /ˌæl.(j)uˈmɪn.i.əm/

日本語話者が苦手な音：

  • /r/ と /l/ の区別 — /l/ は舌先を歯茎につけ、/r/ はどこにもつけない: horizontal /ˌhoɹəˈzɑn.təl/, electron /ɪˈlɛk.tɹɑn/, principle /ˈpɹɪn.sɪ.pəl/, explore /ɪkˈsploɹ/, randomly /ˈɹændm̩li/
  • /v/ — /b/ にならないように、上の歯を下唇に当てる: vertical /ˈvɝ.tɪ.kəl/, objective /ɒbˈd͡ʒɛk.tɪv/, overview /ˈoʊ.vɚˌvjuː/
  • /f/ — 「フ」ではなく、上の歯と下唇で出す: classify /ˈklæs.əˌfaɪ/, sulfur /ˈsʌl.fə/

この動画での練習方法

  1. まず声を出さずに動画を最後まで聞き、知らない単語をメモします。
  2. 通常の速度で一文ずつシャドーイングし、話し手のリズムに合うまで繰り返します。
  3. 自分の声を録音して元の音声と比べます。element, periodic, arrangeなどの単語に特に注意しましょう。

シャドーイングとは？英語上達に効果的な理由

シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。

シャドーイングのやり方: ステップ別の完全ガイドを読む →