Question

a) Define: i) Atomic mass number
ii) Variable valency​

Answer 1

Answer:

i.The mass number (symbol A, from the German word Atomgewicht [atomic weight]), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. ... The mass number is different for each different isotope of a chemical element.

ii.Frequently Asked Questions on Variable Valency

Some elements vary in their ability to interact with other elements, depending on the nature of the reaction; variable valence is called this property. Iron (Fe), for example, may have a valence of both 2 and 3.

Answer 2

i) Atomic mass number : Atomic Mass Number, is the total number of protons and neutrons in an atomic nucleus.

ii) Variable Valency: When an element has more than 1 valency.

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