Atomic Structure Review

The _____ of an element is the number of protons of each atom of that element.

• mass number

• isotope

• molar mass

• atomic number

The net charge on a particle that consists of 10 protons, 12 neutrons, and 13 electrons is:

• +5

• –3

• +3

• –9

Particles that make up atoms are called subatomic particles and are differentiated from one another by:

• mass and energy

• shape and size

• mass and charge

• charge and volume

The isotopes of an element have the same:

• atomic mass

• atomic number

• number of neutrons

• volume

What is the total number of protons and neutrons in an atom of magnesium?

• 12

• 13

• 15

• 24

The scientist credited with the discovery of the electron is:

• Rutherford

• Bohr

• Thomson

• Dalton

Element X has two natural isotopes. The isotope with a mass of 10.012 amu has a relative abundance of 19.91%. The isotope with a mass of 11.009 amu has a relative abundance of 80.09%. Calculate the average atomic mass of element X.

• 10.810

• 10.511

• 17.572

• 10.211

How many protons are present in this nitrogen ion (¹⁴N^-3)?

• 4

• 10

• 7

• 14

How many electrons are present in this ion(¹⁴N^-3)?

• 4

• 10

• 7

• 14

How many neutrons are present in this ion(¹⁴N^-3)?

• 14

• 4

• 10

• 7