Important Terms

Question 1

Atomic Number

Answer 1

• No. of protons present in nucleus
• Denoted as Z
• No. of protons = No. of electrons

Question 2

Mass Number

Answer 2

• No. of nucleons(protons and neutrons) present in nucleus
• Denoted by A
• A = no. of protons + no. of neutrons

Question 3

Isotopes

Answer 3

• Same atomic number, different mass number

Question 3

Isobars

Answer 3

• Same mass number, different atomic number