Atomic Number & Charge of an atom

 Atomic Number

The atomic number of an element is the number of protons in the nucleus of each atom of that element. An atom can be classified as a particular element based solely on its atomic number. Since atoms are neutral, the number of electrons in an atom is equal to the number of protons. 

Atomic Number is represented by the letter Z

For example, carbon’s atomic number is 6 because it has 6 protons.

Mass Number: 

The mass number is defined as the total number of protons and neutrons in an atom.

 Mass Number is represented by the letter A. 

Example: For a carbon (C) element, the Mass number of carbon is 12 & the atomic number is 6.

To understand the atomic number; please click the link below

 https://www.youtube.com/watch?v=_S7ov25y3_M

Charge of an atom:

When an atom has equal numbers of positive and negative particles, it has a neutral charge. But if an atom has extra electrons or is missing electrons, it is known as an ion, and it may bear a positive or negative charge.

 To understand the charge of atom; please click the link below

 https://www.youtube.com/watch?v=xz14VaLMw1U