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2018 O Level Chem P1 Q25 — Periodic Table / Group Trends Solution

Periodic Table / Group Trends 2018 O Level Pure Chemistry · Paper 1 · Q25

Question

Some properties of elements in the same group of the Periodic Table are listed. 1 charge on the ion 2 number of outer shell electrons 3 number of protons 4 total number of inner shell electrons Which properties show an increase as the group is descended?

A1 and 2
B1 and 3
C2 and 4
D3 and 4

Correct answer: D

Video Solution

Explanation

Answer: D (3 and 4). Going down a group, the elements keep the same number of outer-shell electrons and so the same ionic charge.

Property 1 (charge on the ion) and property 2 (number of outer-shell electrons) therefore do not change. Property 3 (number of protons) increases, because each step down the group is a heavier element. Property 4 (total number of inner-shell electrons) increases, because each step down adds another inner shell beneath the valence shell.

Only properties 3 and 4 increase. Answer D.

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