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[" An atom of an element "X" may be writ...

[" An atom of an element "X" may be written as "9X" ."],[" (a) 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 of electrons 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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