Define the following terms:(a) Atomic number(b) Mass number(c) Nucleon

1.	Define the following terms:(a) Atomic number(b) Mass number(c) Nucleons(d) Valence shell
Answer» (a) Atomic number: Atomic number refers to the number of protons present in an atom. It is denoted by Z. Example: An atom of oxygen contains 8 protons Therefore its atomic number is 8. (b) Mass number: Mass number refers to the sum of the number of protons and neutrons present in the nucleus of an atom and denoted by A Mass number = Number of protons + Number of neutrons. (c) Nucleons: The protons and neutrons collectively are known as nucleons. (d) Valence Shell: The outermost shell of an atom is known as its valence shell.

Define the following terms:(a) Atomic number(b) Mass number(c) Nucleons(d) Valence shell

Answer»

(a) Atomic number: Atomic number refers to the number of protons present in an atom. It is denoted by Z. Example: An atom of oxygen contains 8 protons Therefore its atomic number is 8.

(b) Mass number: Mass number refers to the sum of the number of protons and neutrons present in the nucleus of an atom and denoted by A Mass number = Number of protons + Number of neutrons.

(c) Nucleons: The protons and neutrons collectively are known as nucleons.

(d) Valence Shell: The outermost shell of an atom is known as its valence shell.

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