Atomic Theory Unit Exam

Front

What is the main contribution of John Dalton to atomic theory?

Back

He discovered that every element consisted of one type of atom.

Front

Which subatomic particle is found in the nucleus of all isotopes of hydrogen?

Back

Cannot be determined.

Front

Which symbols represent isotopes of the same element? I. 77_35X II. 77_33X III. 81_37X IV. 81_35X

Back

I and IV.

Front

In a correctly written atomic symbol, what is located in the 'A' position?

Back

Mass number.

Front

What defines isotopes of an element?

Back

Isotopes are atoms of the same element with different numbers of neutrons.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus.

Front

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

Back

Mass number - Atomic number.

Front

What is the charge of a proton?

Back

Positive.

Front

What is the charge of a neutron?

Back

Neutral.