Ions and Isotopes

Front

What is an ion?

Back

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

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

How do you determine the atomic number of an element?

Back

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

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

What is the nuclide symbol for an atom with 17 protons and 18 neutrons?

Back

The nuclide symbol is 35Cl (Chlorine-35).

Front

If a neutral atom has 8 electrons, what is its atomic number?

Back

The atomic number is 8.

Front

How many neutrons are in a bromine atom with a mass number of 80?

Back

There are 45 neutrons in a bromine atom with a mass number of 80.

Front

What is the charge of a magnesium ion with 10 electrons?

Back

The charge of the magnesium ion is +2.

Front

How do you find the number of neutrons in an isotope?

Back

Subtract the atomic number from the mass number.

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.