An atom has mass number A and atomic number Z.
How many protons are present in the nucleus?
Hence, it has Z numbers of protons present in the nucleus.
How many neutrons are present in its nucleus?
Atom A has a mass number 209 and atomic number 82.
Atom B has a mass number 209 and atomic number 83.
(i) How many protons atom A has ?
(ii) How many protons atom B has ?
(iii) Are atoms A and B isotopes of the same element ?
Helium atom has an atomic mass of 4u and has two protons in its nucleus. How many neutrons does it have?
How many electrons are revolving around the nucleus?
An element has atomic number 19 and mass number 39. How many electrons and protons are present in its unipositive ion?