The Atom Test Review

Look at this picture of Argon off the periodic table. Which of the following is true for this element?

• 18 protons

• 40 protons

• 22 protons

• 21.9 protons

A neutral subatomic particle contained in the nucleus. 

• proton
• neutron
• electron
• positron

A positive subatomic particle found in the nucleus

• proton
• neutron
• electron
• positron

What is the mass number?

• The average atomic mass
• the number of protons and neutrons in the nucleus
• the number of protons in the nucleus
• the number of protons and electrons in the nucleus

What is the average atomic mass?

• The weighted average of all the naturally occurring isotopes.
• the same as the mass number
• the number of protons and neutrons in the nucleus
• the mass of all the electrons in an atom

A negative subatomic particle

• proton
• neutron
• electron
• positron

An isotope of Carbon has 7 neutrons, what is its mass number?

• 7
• 6
• 13
• 1

A concept in dalton's atomic theory that is no longer considered true.

• atoms are the smallest particle
• atoms combine in simple whole number ratios
• atoms are made up of protons, neutrons and electrons

Discovered the electron with the cathode ray tube experiment.

• John Dalton
• J.J. Thomson
• E Rutherford
• Neils Bohr

How many protons in Neon - 22?

• 22
• 10
• 12
• 32