Question

10. Define:
(a) atomic number
(b) mass number.​

Answer 1

Answer:

(a) The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus

( b) The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units

Answer 2

Answer:

atomic number-

the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.

Mass number-

the total number of protons and neutrons in a nucleus.

Explanation:

Mass number-

The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units

Atomic number-

Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus. Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.

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