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2.2 The periodic table

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Question 10
H

Argon was discovered in 1894, after Mendeleev had published his periodic table. Argon is very unreactive and its relative atomic mass is 39.9.

(relative atomic masses: Cl = 35.5, K = 39.1, Ca = 40.1)

Why was argon difficult to place in the table using Mendeleev's method?

[1]
A

Its relative atomic mass put it between K and Ca, and no group had similar properties

B

Its relative atomic mass put it between Cl and K, but its atomic number was not known

C

Its relative atomic mass put it between Cl and K, so it had to go in the group with Cl

D

Its relative atomic mass put it between K and Ca, but it reacted like the Group 2 metals

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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