Q2 of 17 Page 24

Atomic number of an atom Z = 17, Mass number = 35.

Find the number of protons, electrons and neutrons in the atom.

Since, atomic number of an atom = the number of protons.

Hence, the number of protons is 17.


Now, the number of protons = the number of electrons.


∴ The number of electrons is also 17.


Given: Mass number = 35


We know that mass number = number of protons + number of neutrons.


∴ Number of protons + number of neutrons = 35


⇒ 17 + number of neutrons = 35


⇒ Number of neutrons = 35 – 17


⇒ Number of neutrons = 18


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