Atomic Theory Quiz

Smallest piece of an element that is capable of independent existence.

• Molecule

• Formula Unit

• Ion

• Atom

Atoms of the same element with different numbers of neutrons.

• Formula Unit

• Isotopes

• Isomers

• Protons

How many neutrons are there in an atom of Lithium-7?

• 4

• 3

• 7

• 10

What is the name for the total number of protons in the nucleus of an atom?

• Atomic Number

• Mass Number

• Isotope Number

• Average Atomic Mass

What is the name for the total of all of the protons and neutrons in the nucleus of an atom?

• Atomic Number

• Isotope Number

• Mass Number

• Average Atomic Mass

How many protons are in an atom of Calcium?

• 40

• 40.08

• 20

• There are no protons in calcium

How many electrons are there in an atom of Sodium-23

• 11

• 12

• 23

• 34

Which of the following IS a part of Dalton's Atomic Theory?

• Atoms are made up of protons and neutrons.

• Electrons are lost or gained during chemical changes

• Atoms are indivisible

• Atoms are positively charged

What is the mass number of Copper-63?

• 29

• 63

• 34

• 92

This scientist discovered the nucleus of an atom.

• Dalton

• Democritus

• Mendeleev

• Rutherford