Atoms and Periodic Table

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What makes an atom neutral?

Back

An atom is neutral if it has the same number of protons and electrons.

Front

What does the atomic number represent?

Back

The atomic number represents the number of protons in an atom.

Front

What information does the period (row) of the periodic table provide?

Back

The period indicates the number of shells or energy levels an atom has.

Front

What are protons and electrons?

Back

Protons are positively charged particles found in the nucleus, while electrons are negatively charged particles that orbit the nucleus.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

How do you calculate the number of neutrons in an atom?

Back

Number of neutrons = Atomic mass - Atomic number.

Front

If an element has an atomic number of 20, how many protons does it have?

Back

It has 20 protons.

Front

What is the atomic mass of an atom?

Back

The atomic mass is the total number of protons and neutrons in the nucleus.