RETEST - Atomic Structure

How many electrons does the pictured krypton atom contain?

• 84
• 36
• 48
• 120

Which of the following best describes the Bohr model atom?

• It shows that electrons are evenly scattered in the atom
• Electrons are in the nucleus of an atom
• Electrons are in orbits around the nucleus
• It showed that electrons can be found anywhere in the atom

How many electrons on in this atom of nitrogen?

• 15
• 7
• 3
• 10

What does the number after Carbon-12 represent?

• the atomic mass
• the ion charge
• the number of neutrons
• the number of protons

What element is this?

• Sodium
• Magnesium
• Carbon
• Oxygen

An atom has 16 protons and 18 electrons.  What is the charge on the atom?

• 0 (neutral)
• +2
• -2
• -18

An atom has 56 protons, 81 neutrons, and 54 electrons.  What is the mass of this atom?

• 137
• 110
• 81
• 56

What is an isotope?

• An atom with a charge
• The same elements that have different masses
• An atom with more protons than electrons
• Two elements with the same number of neutrons

What is an isotope?

• An atom with a charge
• The same elements that have different masses
• An atom with more protons than electrons
• Two elements with the same number of neutrons

Which subatomic particle was discovered by Thomson?

• Electrons
• Protons
• Neutrons
• Quarks