Atom Practice

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the identity of the element.

Front

How many protons are in a phosphorus atom?

Back

A phosphorus atom has 15 protons.

Front

What subatomic particle has a negative charge?

Back

The electron has a negative charge.

Front

What is an isotope?

Back

An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons.

Front

How do you determine the mass number of an atom?

Back

The mass number is the sum of protons and neutrons in the nucleus of an atom.

Front

What is the smallest subatomic particle?

Back

The electron is the smallest of the listed subatomic particles.

Front

What identifies the element in the periodic table?

Back

The number of protons identifies the element in the periodic table.

Front

What is the mass number of Yttrium-89?

Back

Yttrium-89 has a mass number of 89, which is the sum of its 39 protons and 50 neutrons.

Front

How many neutrons are in titanium-48?

Back

Titanium-48 has 26 neutrons (48 - 22 protons = 26 neutrons).

Front

What is the charge of a proton?

Back

A proton has a positive charge.