Atomic Theory and Structure of an Atom

Front

What is the key discovery of the Ernest Rutherford Nuclear Model?

Back

The mass of the atom and its positively charged particles were in the nucleus, with low mass negatively charged particles surrounding it.

Front

Where is the mass of the atom primarily located?

Back

In the nucleus.

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus of an atom.

Front

What is an ion?

Back

An atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What happens when an atom loses electrons?

Back

It becomes positively charged and is called a cation.

Front

What happens when an atom gains electrons?

Back

It becomes negatively charged and is called an anion.

Front

What is the charge of an ion with a (+) sign?

Back

It has lost electrons and is positively charged.

Front

What is the charge of an ion with a (-) sign?

Back

It has gained electrons and is negatively charged.

Front

What are protons?

Back

Positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutral particles found in the nucleus of an atom.