1) An atom of nitrogen has 7 protons. How many protons does an atom of silicon have? 2) The element zinc (Zn) has an atomic number of 30. How many neurons does an atom of zinc contain?

Answer :

(1) The number of protons in silicon is, 14

(2) The number of neutrons in zinc is, 35

Explanation :

Atomic number is defined as the number of protons or number of electrons.

Atomic number = number of protons = number of electrons

Mass number is defined as the sum of number of protons and number of neutrons.

Number of neutrons = Mass number - Number of protons

Prat 1 :

As we know that, silicon is a metalloid which belongs to group 14 and period 3.

The atomic number of silicon = 14

Atomic number = Number of protons = 14

Part 2 :

The given element is, zinc (Zn)

Atomic number of Zn = 30

Atomic number = Number of protons = 30

Mass number of Zn = 65

Number of neutrons = Mass number - Number of protons

Number of neutrons = 65 - 30

Number of neutrons = 35