Chemistry
An atom of an element Y may be written as 94Y.
(a) What does the figure 9 indicate?
(b) What does the figure 4 indicate?
(c) What is the number of protons in atom Y?
(d) What is the number of neutrons in atom Y?
(e) What is the number of electrons in atom Y?
(f) How many electrons are there in the outermost shell of an atom of element Y?
(g) Write the symbol of ion formed by an atom of element Y?
Atomic Structure
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Answer
(a) Mass number is indicated by figure 9, which is the sum of protons and neutrons in the nucleus of an atom.
(b) Atomic number is indicated by figure 4, which is the number of electrons present in a neutral atom.
(c) 4, as the atomic number also indicates the number of protons in the nucleus of an atom.
(d) 5, number of neutron = mass number - number of protons = 9-4=5
(e) 4, as the atomic number is 4, which is the number of electrons present in a neutral atom.
(f) 2, its electronic configuration is [2, 2]
(g) Y2+, as it has the valency of +2, hence it loses two valence electrons and becomes a positively charged ion.
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