Two atoms A and B have the following nuclear composition:
Atom A         Atom B
17 protons      17 protons 
18 neutrons     20 neutrons 
17 electrons     17 electrons

a) What is the mass numbers and atomic numbers of A and B.
b) What is the relation between the two chemical species?
c) which element or elements do they represent?

1.   Mass number or A = sum of protons and neutrons

 Mass number of A = 35   and that of  B is 37

2.  They have the same atomic number but different atomic mass and so are isotopes.

3. Chlorine, Cl

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