Atoms and the Periodic Table

How many protons are found in the nucleus of one atom of calcium?

• 2
• 20
• 21
• 40

• Beryllium
• Boron
• Helium
• Fluorine

How many neutrons are found in the nucleus of one atom of fluorine?

• 7
• 9
• 10
• 19

• Beryllium
• Magnesium
• Carbon
• Oxygen

Almost all of the mass of an atom is found ____.

• outside the nucleus
• in the energy levels
• in the electron cloud
• in the nucleus

• Boron
• Oxygen
• Silicon
• Nitrogen

How many electrons are found in the electron cloud in one atom of boron?

• 3
• 5
• 6
• 11

• Oxygen
• Neon
• Calcium
• Argon

An atom has 11 protons, 12 neutrons, and 11 electrons. What is the atomic mass?

• 11
• 22
• 23
• 34

• Phosphorus
• Sulfur
• Boron
• Gallium