Question

an atom contains 3 protons,3 electrons and 4 neutrons. what is its atomic number, mass number and valency?

Answer 1

Heya user,
Sneha here,
here is your answer,

if an atom contains 3 protons(p+), 3 electrons(e-), 4 neutrons (n) then the

Atomic number would be 3

as we know atomic number of an atom is equal to the number of protons in it so since the number of protons is 3 so the atomic number of the atom is also 3.

Atomic mass (mass number) of the atom would be 7u

Since the atomic number of the atom is 3, the atomic mass (mass number) is 3×2+1 = 7u ( +1 sice 3 is a odd number).

Valency of the atom would be 1

as since the atom has 3 electrons , So 2 electrons will be in the K shell and (3-1=1) 1 electron will be in the L shell ans as we know if the number of electron in the outhermost orbit/shell is 1,2 or 3 then the valency is equal to the valence electrons (1,2 or 3).




Hope this helps

if u want more detail or have any other doubt u can ask me frankly.


Thank you


#Sneha