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Solutions: Atomic Structure

Q2.

(a) z is a neutral atom of thorium. How many protons, neutrons and electrons does it contain?

90 (protons); (232 – 90 gives) 142(neutrons); 90(electrons) (two correct for 1 mark - all correct for two)

(2)

(b) z is a neutral atom of a different isotope of thorium which contains Z electrons. Give possible values for X, Y and Z.

X = 90
Y = (any value between) 212 and 252
Z = 90

(3)
(Total 5 marks)