Atomic Theory

Front

James Chadwick discovered the ________.

Back

neutron

Front

A tiny but very dense, positively charged portion of the atom that holds most of the atomic mass is called the ________.

Back

Nucleus

Front

The scientist responsible for 'discovering' the nucleus is:

Back

Rutherford

Front

Subatomic particles with a positive charge are called ________.

Back

protons

Front

Which scientist developed the atomic theory?

Back

John Dalton

Front

The center of an atom, containing protons and neutrons, is known as the ________.

Back

nucleus

Front

The negatively charged subatomic particle that orbits the nucleus is called a ________.

Back

electron

Front

The model that describes the atom as having a dense nucleus surrounded by electrons in defined orbits is known as the ________ model.

Back

Bohr model

Front

The atomic number of an element is determined by the number of ________ in its nucleus.

Back

protons

Front

The mass number of an atom is the sum of its ________ and ________.

Back

protons; neutrons