Question

The number of protons present in the nucleus of an atom is known as its _______________________________.

Answer 1

• Atoms are the building blocks of matter
• Atom contains 3 types of sub-atomic particles which are electrons, protons, and neutrons.
• There is a positive region within the atom at its center, which is called the nucleus.
• Protons and neutrons are present inside the nucleus while electrons are present outside the nucleus.
• Every atom contains an equal number of protons and electrons.
• Number of protons present in the nucleus of an atom is equal to its atomic number(Z).

Example

• Chemical symbol of element $\mathrm{Sodium}$ = $\mathrm{Na}$
• Atomic number(Z) = 11
• Number of Protons = Atomic number = 11

Thus, The number of protons present in the nucleus of an atom is known as its atomic number.