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Questions 1.3(b)

  1. State two similarities between the atoms A, D and E.
  2. Identify two ways in which all the three atoms are different.
  3. What is the evidence that these atoms represent the same element?
  4. Which element do these atoms represent? Explain your answer.

    5. Hint: Refer to Table 1.2.3

  5. Which of the atoms A, D and E is the lightest, and which one is the heaviest?


Answers to Questions 1.3(b)

  1. They have the same number of protons or atomic number. They have the same number of electrons.
  2. They have different numbers of neutrons. They have different mass numbers.
  3. They all have the same number of protons, which is one (1).
  4. Hydrogen. From Table 3, hydrogen is the element with atomic number, 1 (or one proton)
  5. Lightest: A; Heaviest: E.