Unit 2 Review

A neutral atom may contain 8 protons, ________.

• 9 neutrons and 10 electrons

• 9 neutrons and 8 electrons

• 8 neutrons and 10 electrons

• 10 neutrons and 9 electrons

You can determine the identity of an element if you know how many ________ it has.

• protons

• neutrons

• electrons

• energy levels

The nucleus of an atom has all of the following characteristics EXCEPT that it ________.

• is positively charged.

• contains nearly all of the atom’s mass.

• contains nearly all of the atom’s volume.

• is very dense.

The element boron has two naturally occurring isotopes – one with an atomic mass of 10.01 and another with an atomic mass of 11.01. Given the information provided on the periodic table, which do you think is the most abundant isotope?

• The one with an atomic mass of 10.01.

• The one with an atomic mass of 11.01.

• They are both equally as abundant.

• Not enough information is provided to answer this.

An element with 5 protons, 6 neutrons, and 8 electrons has an atomic number of ________.

• 5

• 6

• 8

• 11

An element with 5 protons, 6 neutrons, and 8 electrons has a mass number of ________.

• 5

• 6

• 8

• 11

How many valence electrons does an atom of magnesium typically have?

• 2

• 3

• 12

• 24

How many valence electrons does an atom of aluminum typically have?

• 2

• 3

• 13

• 27

The name of the force that is able to overcome the repulsive force between protons in an atom is the ________.

• weak nuclear force

• strong atomic force

• strong nuclear force

• electromagnetic force

The number of energy levels an atom will have is based on the number of ________ it has.

• protons

• neutrons

• electrons

• quarks