Subatomic Particles Practice

Front

What is the mass number of an atom?

Back

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

Front

How many protons are in a neutral atom of magnesium-25?

Back

A neutral atom of magnesium-25 has 12 protons.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

What is the mass number of fluorine-19?

Back

The mass number of fluorine-19 is 19, which is the sum of its 9 protons and 10 neutrons.

Front

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

Back

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

Front

What is the atomic number of calcium?

Back

The atomic number of calcium is 20, which is the number of protons in its nucleus.

Front

What is the significance of the mass number in identifying an isotope?

Back

The mass number helps identify isotopes, which are atoms of the same element with different numbers of neutrons.

Front

What is the electron configuration of a neutral magnesium atom?

Back

The electron configuration of a neutral magnesium atom is 1s² 2s² 2p⁶ 3s².

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 many electrons does a neutral atom of fluorine-19 have?

Back

A neutral atom of fluorine-19 has 9 electrons.