Subatomic Particles and Energy Levels/Orbitals

How many electrons are in Potassium

• 19

• 39

• 20

• 58

How many neutrons are in magnesium?

• 12

• 24

• 25

• 36

How many neutrons does beryllium have?

• 4

• 5

• 9

• 13

How do you find the number of neutrons in an atom?

• It's the same as the atomic #

• It's the same as the mass number

• Subtract the atomic # from the mass number

• Add the mass number and the atomic #

How many electrons are in Aluminium?

• 40

• 27

• 13

• 14

How many electrons can the first energy level hold?

• 1
• 2
• 8
• 0

The electron configuration of an atom is 1s²2s²2p⁶.  The number of electrons in the atom is 

• 3
• 6
• 8
• 10

Which electron configuration belongs to Chlorine (Cl)?

• 1s² 2s² 2p⁶ 3s² 3p⁵
• 1s² 2s² 2p⁶ 3s² 3p⁶
• 1s² 2s² 2p⁶ 3s² 3p⁷

What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵
• 1s²2s²2p⁴
• 1s²2s²2p⁶
• 1s²2s²2p⁶3s²3p⁶4s²3d¹

How many electrons can the s sublevel hold?

• 14
• 10
• 2
• 6