DP Chemistry (last assessment 2024)

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Question 18M.2.sl.TZ2.3b.i

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.2.sl.TZ2.3b.i
Level sl Paper 2 Time zone TZ2
Command term Outline Question number b.i Adapted from N/A
b.i.
[Maximum mark: 1]
18M.2.sl.TZ2.3b.i

The emission spectrum of an element can be used to identify it.

Elements show trends in their physical properties across the periodic table.

(b.i)

Outline why atomic radius decreases across period 3, sodium to chlorine.

[1]

Markscheme

same number of shells/«outer» energy level/shielding AND nuclear charge/number of protons/Zeff increases «causing a stronger pull on the outer electrons»

[1 mark]

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