Question

What is an Atomic mass ?
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Answer 1

Answer:

Only hydrogen atoms have one Proton in their nuclei. Only helium atoms have two protons. indeed, only gold atoms have 79 protons. This shows that the number of protons in the nucleus of an atom decides which element it is. This very important number is known as the atomic number (Proton number, given the symbol Z) of an atom.

Atomic number(Z)=Number of Protons=Number of Electrons

Protons alone do not make up all of the mass of an atom. The neutrons in the nucleus also contribute to the total mass. The mass of the electron can be regarded as so small that it can be ignored.As a proton and a neutron have the same mass, the mass of a particular atom depends on the total number of protons and neutrons present. This number is called the mass number (or nucleon number, given the symbol A) of the atom.

Mass number = Number of Protons + Number of Neutrons

For any element, the atomic numbers are shown as subscripts the mass number are shown as superscripts.

The difference between the mass number of an element and its atomic number gives the number of neutrons present in one atom of the element.

Number of Neutrons (n) = Mass number(A) - Atomic number(Z)

Explanation:

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