Question

An atom 'X' has atomic number 9 and has 10 neutrons. Find its (2) a) mass number b) number of protons c) number of electrons d) electronic configuration​

Answer 1

Answer:

a) mass number = atomic number+ no of neutron = 9+10=19

b) no of proton = atomic number = 9

c) no of electron = no of proton ( neutral atom) = 9

d) 2,7