Vocab Check-in #5

Front

Who developed the Billiard Ball Model of the atom?

Back

John Dalton developed the Billiard Ball Model of the atom, which proposed that atoms are solid, indivisible spheres.

Front

What did Ernest Rutherford discover about the atom?

Back

Ernest Rutherford discovered that the atom has a small, dense, positively charged nucleus.

Front

How many protons does an atom with an atomic number of 28 have?

Back

An atom with an atomic number of 28 has 28 protons.

Front

What is the atomic number?

Back

The atomic number is based on the number of protons in the nucleus of the atom.

Front

If an element has a mass number of 40 and an atomic number of 28, how many neutrons does it have?

Back

It has 12 neutrons (mass number - atomic number = neutrons: 40 - 28 = 12).

Front

What is the definition of an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons.