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2.2 The periodic table

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Question 8
H

Phosphorus is used to make matches. Phosphorus has atomic number 15.

a.

Give the electronic configuration of phosphorus.

[1]
b.

Explain how the electronic configuration of phosphorus shows its group and its period.

[2]
c.

Boron has atomic number 5. Give the electronic configuration of boron and state its group and period.

[2]
d.

Helium has two electrons in its outer shell, but it is placed in group 0, not group 2. Explain why.

[2]
e.

Explain why elements in the same group have similar chemical properties.

[1]
f.

Phosphorus forms phosphide ions, P3−\mathrm{P^{3-}}P3−. Give the electronic configuration of a phosphide ion.

[1]
Markscheme

2.2 The periodic table Questions

  1. GCSE
  2. /Chemistry
  3. /2.2 The periodic table

50 exam-style questions on Edexcel GCSE Chemistry 2.2 The periodic table, covering 2.2.1 Mendeleev's periodic table, 2.2.2 Periods, groups, metals and non-metals, and 2.2.3 Electronic configuration and position in the periodic table. Each one has a worked solution and a mark scheme showing where the marks go.

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