Question

Define the following terms::



(a) Atomic number

(b) Mass number

(c) Nucleons

(d) Valence shell​

Answer 1

• Atomic number : 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.

• Mass number : the total number of protons and neutrons in a nucleus.

• Nucleons : a proton or neutron.

• Valence shell : In chemistry and physics, a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.

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Answer 2

Answer:

hi mate

here is your answer ✌

(a) Atomic no.

=no. of electrons,protons,neutron.

(b) Mass no.

=mass of 1 atom.

(c) Nucleons

=proton + neutron.

(d) valence shell

=last shell of an atom.

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