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JCE (Botswana) The Periodic Table — practice questions

Explore 3 free The Periodic Table questions in JCE (Botswana) Science. Open each question or exercise to read its content, reference answers and available explanation.

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The Periodic Table questions and exercises with answers

Showing questions 1–3 of 3.

How is the two letter symbol of an element written?Read the answer and worked solution →What does the atomic number of an element count?Read the answer and worked solution →Mendeleev left gaps in his table of the elements. What did he believe those gaps meant?Read the answer and worked solution →

Worked practice questions

How is the two letter symbol of an element written?

  1. Small then capital letter
  2. Two capital letters
  3. Capital then small letter
  4. Two small letters
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Correct answer: C. Capital then small letter

1. Each element has its own short symbol so that writing is quicker. 2. The first letter of a symbol is always a capital letter. 3. If there is a second letter it is always a small letter. 4. So magnesium is written Mg and never MG or mg. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Chemical symbols_

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What does the atomic number of an element count?

  1. Its neutrons
  2. Its protons
  3. Its molecules
  4. Its compounds
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Correct answer: B. Its protons

1. Atoms are built from protons, neutrons and electrons. 2. The atomic number counts how many protons an atom of that element has. 3. No two elements have the same number of protons, so the number is unique. 4. Hydrogen has atomic number 1 and carbon has atomic number 6. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Atomic numbers_

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Mendeleev left gaps in his table of the elements. What did he believe those gaps meant?

  1. His table held a mistake
  2. Those elements were destroyed
  3. Elements could not be ordered
  4. Undiscovered elements existed
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Correct answer: D. Undiscovered elements existed

1. Mendeleev arranged the elements he knew by mass and by their properties. 2. A repeating pattern appeared in those properties as he went along. 3. Some places in the pattern had no known element to fill them. 4. Rather than change the pattern, he left those places empty. 5. He argued the gaps stood for elements nobody had found yet. 6. Later discoveries filled every gap, so the modern table has no empty blocks. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Comparing Mendeleev's table with the modern version of the Periodic Table_

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