Question

An atom has 29 protons, 29 electrons, and 35 neutrons. What is the mass number of the atom?
A)64
B)35
C)29
D)93

Answer 1

Answer:

A)64

Explanation:

The mass of an atom is calculated by m = N + P

N is number of neutrons

P is number of protons

Add the number of protons and neutrons.

29 + 35 = 64

The mass is 64.

Electrons weigh almost nothing and are not counted.

Answer 2

The mass number of the atom is 64

HOW TO CALCULATE MASS NUMBER:

• The mass number of an atom can be calculated by adding the number of protons and neutrons in the nucleus of the atom. That is;

• Mass number = no. of protons + no. of neutrons

• According to this question, an atom has 29 protons, 29 electrons, and 35 neutrons. The mass number can be calculated as follows:

• Mass number = 35 neutrons + 29 protons

• Mass number = 64

• Therefore, the mass number of the atom is 64.

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