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2007 Section 2 Question 2

2) B

This is quite an obvious answer. The answer is only asking for 1 statement which is correct. We know that ‘x’ is in period 2. This means that it has 2 shells with the first being completely full. Since, ‘y’ has six more electrons, it must have more than 1 shell as well. This means its first shell must also be full. First shell of any atom can only contain 2 electrons. Therefore, both ‘x’ and ‘y’ must have 2 electrons their first shells. Hence, they have the same number of electrons in the first shell.

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