Physical Science Practice Test 2

Front

How many protons does an element with atomic number 17 have?

Back

17 protons.

Front

What are the subatomic particles with a negative charge?

Back

Electrons.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What are valence electrons?

Back

Subatomic particles found on the outermost shell of an atom, responsible for the atom's reactivity.

Front

What are the horizontal rows in the Periodic Table called?

Back

Periods.

Front

What is the charge of a proton?

Back

Positive charge.

Front

What is the charge of a neutron?

Back

No charge (neutral).

Front

What is the charge of an electron?

Back

Negative charge.

Front

What is an isotope?

Back

Atoms of the same element with different numbers of neutrons.

Front

What is the significance of the atomic mass?

Back

It is the weighted average mass of an element's isotopes.