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An atom of an element X may be written a...

An atom of an element X may be written as `._(4)^(9)X`
What does the figure 9 indicate ?
(b) What does the figure 4 indicate ?
(c) What is the number of protons in atom X ?
(d) What is the number of neutrons in atom X ?
(e) What is the number electron in atom X ?
(f) How many electrons are there in the outermost shell of an atom of element X ?
(g) Write the symbol of ion formed by an atom of element X.

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