Question

answer this question
I just wanted to how to do this like how to find out mass number , atomic number etc.

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Answer 1

Answer:

phosphorus - no of electrons = 15 , no of protons = 15 no of neutrons = 16

potassium - atomic no = 19 , mass no = 39 , no of protons = 19

Explanation:

atomic no = no of electrons = no of protons

mass no = no of protons + no of neutrons

Answer 2

Ok soo a simple method is

Atomic Number Z = No. Of Electrons

And No. of Electrons = No. Of protons

Also Atomic Mass = No. of proton + No. of neutron.

Answer:-

Phosphorus.

Electrons = Protons= 15

Neutron = 16.

Potassium.

Mass Number = 39

Atomic Number = 19

Protons = 19

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