Question

In the elements given below, identify: (a) Mass Number (b) Atomic Number
(c) Number of Protons (d) Number of Electrons (e) Number of Neutrons
2 He,
3Li, 5B, 6C, 13Al

TNSCERT Class 9 General Science Ch4 Atomic Structure

Answer 1

He Atomic number 2 and mass number is 4 Li atomic number is 3 and mass number is 7 B atomic number is 5 and mass number is 13 C atomic number is 6 and mass number 14 Al atomic number is 13 and mass number is 27