What are sub atomic particles?

Name the instrument to measure sub- atomic particles.

Name the sub-atomic particles.

Draw the atomic structure and explain the position of the sub-atomic particles.

Assertion: Very large distances such as distance of a planet or star can be measured by parallax method. Reason: For measuring small masses of atomic/ sub-atomic particles, mass spectrograph is used.

The subatomic particle which is not present in hydrogen atom is _______.