9701 MCQ Solution 2

Question 2: [Physical > Atomic Structure]
One of the most important chemical species responsible for the removal of ozone from the stratosphere is a free radical of chlorine, 35Cl • .
What does 35Cl • contain?

protons
neutrons
electrons
A
17
18
16
B
17
18
17
C
18
17
17
D
18
17
18

Reference: Past Exam Paper – November 2002 Paper 1 Q2



Solution 2:
Answer: B.

Using the data booklet we find that for a particle to be described as chlorine it needs to have 17 protons. 35 is the given mass number of the free radical thus 35 – 17 = 18. There are 18 neutrons because protons and neutrons are the only particles in an atom that carry mass. The free radical does not carry a charge thus meaning that opposing charge carrying particles (protons and electrons) must be equal in number so they cancel out to give no overall charge.

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