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AS Chemistry Chapter 1
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1 (a) a
toms with the same number of protons and 1
different number of neutrons

(b) 37
17
Cl 2 There have been a few questions like
this over the years. It's just getting…

Page 2

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AS Chemistry Chapter 1
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4 (a) (i) a toms with the same number of Always learn definitions. Then they are
protons and with different numbers of `easy' marks.
neutrons
(ii) isotopes have the same electron 3
configuration

(b) 1s22s22p63s1…

Page 3

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AS Chemistry Chapter 1
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(b) (54 × 5.8) + (56 × 91.6) + (57 × 2.6) 2 % told so divide the abundance by 100.
100
= 55.9

(c) (i) 1s22s22p63s23p63d6 1 You really need to know the order…

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