The mass number of a nucleus is
(a)Sometimes less than and sometimes more than its atomic number
(b)Always less than its atomic number
(c)Always more than its atomic number
(d)Sometimes equal to its atomic number
The mass number of a nucleus is
(a)Sometimes less than and sometimes more than its atomic number
(b)Always less than its atomic number
(c)Always more than its atomic number
(d)Sometimes equal to its atomic number










