Structure of At...

 What tool was Thomson using when he discovered the electron?

Define the atomic mass unit.

The difference between the mass number and the atomic number gives the _______.

Bohr modified the ___________ by adding that the electrons move in orbits of fixed size and energy.

The atomic number of an element is $$32$$ and mass number $$55$$. Calculate the number of neutrons?

Thomson showed that the stream of particles in cathode ray tube is made up of small particles which are a component of the atom and is:

The atomic number is identical to the amount of ______ in the atom nucleus. 

Atomic number of an atom is equal to the __________.

Relative molecular mass is the ratio of __________.

Atomic number of nitrogen is 7 . The number of protons in Nitrogen atom is equal to ________.