Question

atomic number and atomic mass number ​

Answer 1

Its nucleus also contains two neutrons. Since 2+2=4, we know that the mass number of the helium atom is 4. Finally, the helium atom also contains two electrons, since the number of electrons must equal the number of protons.

Its nucleus also contains two neutrons. Since 2+2=4, we know that the mass number of the helium atom is 4. Finally, the helium atom also contains two electrons, since the number of electrons must equal the number of protons....

Its nucleus also contains two neutrons. Since 2+2=4, we know that the mass number of the helium atom is 4. Finally, the helium atom also contains two electrons, since the number of electrons must equal the number of protons....Mass Number.

Answer 2

Answer:

Atomic Number :-

1) It is denoted by "Z" .

2) Number of protons in the nucleus =

Number of electrons in neutral atom .

Atomic Mass Number :-

1) It is denoted by " A " .

2) Number of neutrons + Number of protons ,

A = n + p

We can find number of neutrons by

===> A - Z

Explanation:

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