Question

What are isotopes? Draw the isotopes of Hydrogen.

TNSCERT Class 9 General Science Ch4 Atomic Structure

Answer 1

each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.

Answer 2

elements that have same atomic number but have different mass number.

isotopes of hydrogen are
1 protium
2 deutrium
3 tritium