Read the following and answer any four questions from 18.1 to 18.5
In the following table, the mass number and the atomic number of certain elements are
given:
18.1 Number of neutrons present in F
a) 11 b) 6 c) 5 d) 16
18.2. Which atoms are isotopes of same element
a) A and B b) A & C c) B and C d) C and D
18.3
Atom(s) will form singly positively charged ion
a) A and C b) C and D c) A and H d) D and H
18.4. Which is the atom of an inert gas?
a) A b) B c) C d) D
18.5 Which of these has 11 electrons
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