Unit 4 Electrons Reivew

The atomic number for an element with a ground-state electron configuration of 1s² 2s² 2p⁶ 3s² 3p⁵ is

• 17

• 11

• 5

• cannot be determined

In order to occupy the same orbital, two electrons must

• spin in the same direction

• spin in opposite directions

• have a high quantum number

• have low energy

If 3 electrons are available to fill the three empty p orbitals, how will the electrons be distributed in the three orbitals?

• 
• 
• 
• 

Which of the following wavelengths has the highest energy and is the most dangerous?

• gamma waves

• microwaves

• radio waves

• violet light

The major difference between a 2s and a 3s orbital is that the

• 3s orbital is at a higher energy level

• they have different shapes

• 3s orbital can hold more electrons

• 2s orbital can hold only two electron

Some properties of scandium are determined by the electron arrangement within chromium (Cr) atoms. What is the ground state noble gas electron configuration of scandium?

• [Ar] 4s²3p⁴

• [Ar] 4s ²3d⁴

• [Ar] 4s²4p⁴

• [Ar] 4s²4d⁴

The p sublevel can hold a maximum of _ electrons

• 2

• 6

• 10

• 14

For an electron to change from the ground state to an excited state,

• energy must be released (lost)

• energy must be absorbed (gained)

• radiation must be emitted

• the e- must move from a higher to a lower energy state.

Which of the following symbols represents 5 electrons in the p sublevel if the energy level is 2?

• 2p⁵

• 5p²

• P

• 5(2p)

Electrons that have the lowest possible energy are said to be in a

• excited state

• ground state

• inert state

• radiation-emitting state