Answer :

(a) The figure 9 indicates mass number.

(b) The figure 4 indicates atomic number.


(c) The number of protons in atom X should be 4.


(d) The number of neutrons in atom X should be 5.


(e) The number of electrons in atom X is 4.


(f) In the outermost shell of an atom of element X there are 2 electrons.


(g) The symbol of ion formed by an element Z is Lithium (Li)


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