The arrangement of the electrons in an atom

4 marks · Normal

The table below shows the atomic numbers of four elements:

Based on the data, answer the following questions:

(a)

Which element is in Group 0?

[1 mark]

(b)

Which element is in Group 1?

[1 mark]

(c)

Which two elements are in Period 3?

[2 marks]

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

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(a) Neon

(b) Potassium

Also accept: Accept correct element names as alternative spellings.

Common mistakes: Confusing group numbers; Placing elements in the wrong period

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Marking points

B1 (a) · 1 mark · Identifies Neon as the Group 0 element.

B1 (b) · 1 mark · Identifies Potassium as the Group 1 element.

B1 (c) · 2 marks · Identifies Magnesium and Chlorine as the Period 3 elements (either order).

Worked solution

a. Neon is in Group 0 (noble gases).

b. Potassium is in Group 1 (alkali metals).

c. Magnesium and chlorine are in Period 3.