Question

An atom has 5 neutrons with electron configuration 2,2
Give information about its
(i) atomic number (ii) mass number (iii) Valency

Answer 1

Answer:

1.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.

2.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

3. Inchemistry, the valence or valency of an element is a measure of its combining capacity with other atoms when it forms chemical compounds or molecules

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