Question

An atom of an element A may be written as 1224A.
(a) What does the superscript 24 indicate?
(b) What does the subscript 12 indicate?
(c) What are the number of protons and neutrons in an atom A?
(d) Write the symbol of ion formed by an atom of element
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Answer 1

Answer:

what are the number of protons and neutrons in an atom A