Question

(1)Define : (a) Atomic mass number (b) mole (c) valency​

Answer 1

Answer:

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

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A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

valence.=the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.

Answer 2

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$\huge\mathfrak{Atomic\: mass\: and \:mole}$

amu (atomic mass unit) : the standard unit of measurement of atomic mass. Avogadro's number : the number of units in one mole: 6.022 × 1023, which is the number of atoms in 12 grams of carbon-12. molar mass : the mass of one mole of a substance, measured in grams.

$\huge\blue{Valency}$

a measurement of the power of an atom to combine with others, by the number of hydrogen atoms it can combine with or take the place of