UNIT 2 - Review

Front

What is the mass number of an element with 5 protons and 6 neutrons?

Back

11

Front

If a neutral atom has 8 protons, how many neutrons and electrons does it have?

Back

9 neutrons and 8 electrons.

Front

Which isotope of boron is more abundant: one with an atomic mass of 10.01 or 11.01?

Back

The one with an atomic mass of 11.01.

Front

Who first proposed the idea of atomos, meaning indivisible bits of matter?

Back

Democritus

Front

How many valence electrons does magnesium typically have?

Back

2

Front

Define atomic mass.

Back

The weighted average mass of an element's isotopes.

Front

What is an isotope?

Back

Atoms of the same element with different numbers of neutrons.

Front

What is the charge of a proton?

Back

Positive.

Front

What is the charge of a neutron?

Back

Neutral.

Front

What is the charge of an electron?

Back

Negative.