Atomic Number and Atomic Mass

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the mass of one proton compared to one electron?

Back

The mass of one proton is greater than the mass of one electron.

Front

What determines the identity of an element?

Back

The identity of an element is determined by the number of protons in its nucleus.

Front

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

Back

The number of neutrons can be calculated by subtracting the atomic number from the atomic mass.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Tags

NGSS.MS-PS2-3

Front

If an element has an atomic number of 6, how many protons does it have?

Back

It has 6 protons.

Front

What is the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

How many neutrons does an element with an atomic number of 3 and a mass of 6.9 contain?

Back

It contains 4 neutrons.

Tags

NGSS.MS-PS1-1