Atoms

Front

What does the average atomic mass represent?

Back

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

Front

How many protons are in a nitrogen atom?

Back

A nitrogen atom contains 7 protons.

Front

What two particles make up the mass number of an atom?

Back

The mass number of an atom is determined by the total number of protons and neutrons.

Front

If an atom has a mass number of 36 and contains 17 protons, how many neutrons does it have?

Back

It has 19 neutrons.

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 the charge of a sodium ion (Na+) and why?

Back

The charge of a sodium ion (Na+) is 1+ because it has lost one electron.

Front

What is the significance of the atomic number?

Back

The atomic number indicates the number of protons in the nucleus of an atom and determines the element's identity.

Front

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

Back

To calculate the number of neutrons, subtract the atomic number (number of protons) from the mass number.

Front

What is the relationship between protons and the identity of an element?

Back

The number of protons in an atom determines the element's identity and its position on the periodic table.

Front

What is the mass number of an atom with 10 protons and 12 neutrons?

Back

The mass number is 22 (10 protons + 12 neutrons).