Question

what is 1) atomic mass
2) valency
3) atomic number​

Answer 1

Answer:

Atomic mass

the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom.

2 Valency

the property of an element that determines the number of other atoms with which an atom of the element can combine.

3 Atomic number

the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table.

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Answer 2

Explanation:

1)The mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

2)Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.

3)The atomic number is the number of protons in the nucleus of an atom.