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Question

Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons


A
(iii)
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B
(i) 
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C
(iv)
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D
(ii) 
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Solution

The correct options are
C (iv)
D (ii) 
Mass number is the sum of total number of protons and electrons in an element.Atomic number is equal to the number of protons or electrons in an element.

Chemistry

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