Electron Configuration

The number of electrons in the highest electron level of a neutral atom of boron (atomic number 5) is __________.

• 2

• 5

• 3

• 8

• 10

The electron arrangement of any particular atom shows

• the number of isotopes possible.

• a description of the shape of each electron energy level

• the number of electrons in each electron energy level.

• a diagram of an atomic nucleus.

• the maximum number of electrons each electron energy level can hold.

The maximum number of electrons that may occupy the third electron energy level is

• 2

• 8

• 10

• 18

• 32

What element has the electron arrangement 1s²2s²2p⁶3s²3p⁵?

• Be

• Cl

• F

• S

• Ar

What element has the electron arrangement 1s²2s2²p⁶3s²?

• Be

• Mg

• Na

• Ca

• Si

What element has the electron arrangement 1s²2s²2p⁶3s²3p⁶4s²3d⁶?

• Fe

• Kr

• Mn

• Ni

• Ru

The chloride ion has the same electron arrangement as

• an Ar atom

• a Ne atom

• a Kr atom

• a bromide Ion

• a Sodium atom

What is the correct electron configuration for the lithium atom?

• 1s³

• 2s¹

• 1s¹2s²

• 1s²2s¹

• 1s²2s⁵

The number of electron levels (not sublevels) in a magnesium atom is __________.

• 1

• 2

• 3

• 4

• 5

All electromagnetic radiation travels at the same __________.

• velocity

• wavelength

• energy

• frequency

• color