Valence electron and electron configuration

__________________are the electrons in the outermost energy level or shell associated with the atom.

• Valence electrons

• Core electrons

• Protons

• Neutrons

Which electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵

• 1s²2s²2p⁴

• 1s²2s²2p⁶

• 1s²2s²2p⁶3s²3p⁶4s²3d¹

Identify the Electron Configuration for Aluminum (Al)

• 1s² 2s² 2p⁶ 3s² 3p¹

• 1s² 2s² 2p⁶ 3s² 3p³

• 1s² 2s² 2p⁶ 3s² 4p¹

Valence electrons are located...

• inside the nucleus

• in outer space

• on the outermost orbit of an atom

• 10

• 2

• 8

• 18

• 14

• 4

• 3

• 28

How many electrons can the first energy level hold?

• 1
• 2
• 8
• 0

There are 4 different types of subshells s,p,d,f

• true
• false

Energy levels are denoted by:

• letters

• numbers

• a combination of letters and numbers

• subscripts

Each row on the periodic table represents:

• an energy level

• a sublevel

• an electron

• an orbital