Question

Which of the following are true for an element?
Atomic number = number of protons +number of electrons
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) (i) and (ii)
B) (i) and (iii)
C) (ii) and (iii)
D) (ii) and (iv)
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Answer 1

Answer:

Option C) (ii) and (iii)

Explanation:

Mass number is the number of protons + neutrons in one particular atom. Atomic mass is the weighted average of all naturally occurring isotopes of the atom.

Answer 2

Answer:

C

Explanation:

The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

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