Question

Which particles make up the nucleus of an atom?
A. protons and electrons
B. neutrons and electrons
C. protons only
D. protons and neutrons
E. neutrons only

Answer 1

Answer:

The answer is D. protons and neutrons.

Explanation:

The protons and neutrons in the nucleus of an atom is collectively known as nucleons.

Answer 2

Answer:

The answer is (d) Protons and neutrons

Explanation:

The entire mass and the positive charge are concentrated in a very small region at the center of an atom known as the nucleus.

• The nucleus is surrounded by negatively charged electrons
• Electrons are not stationary but are revolving around the nucleus
• Protons and neutrons together are known as nucleons.
• The Mass number is the sum of the number of protons and neutrons present in the nucleus of an atom and it is denoted by the letter A
• Thus, the mass number of an element (A)=Number of protons + Number of neutrons
• Moreover, the number of protons in an atom is equal to the number of electrons
• Therefore, Atomic number of an element  (Z)=Number of protons = Number of electrons
• Number of protons=A-Z