Unit 5 Electrons Review

During a flame test, crystals of an element are passed through the Bunsen burner flame. The flame turns a violet color. What can be concluded from this violet colored flame?

• electrons are moving fast to make a short wavelength

• electrons are moving slow to produce a long wavelength

• electrons are moving fast to make a long wavelength

• electrons are moving slow to make a short wavelength

Answer explanation

since the order of colors is ROY G BIV and its in order from longest to shortest wavelength, violet has the shortest wavelength. Wavelength and frequency/energy are inversely proportional so if it has a short wavelength it will have a high frequency and high energy.

Four different compounds are burned in a flame test. One compound produces a yellow color, one a blue color, one an indigo color, and one a red color. Which compound’s electrons had the GREATEST energy?

• yellow

• blue

• indigo

• red

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

Bohr’s model of the atom had electrons moving in specific paths (called orbits) around the nucleus. This model of the atom is known as the:

• plum pudding model

• nuclear atom model

• quantum mechanical model

• planetary model

What is the name for the lowest, most stable energy state of an atom?

• excited state

• ground state

• elementary state

• quantum state

When an electron moves from the excited state to the ground state which of the following has occurred?

• an electron absorbs light

• an electron moves from a lower energy level to a higher energy level

• an electron emits light

• nothing occurs

Which of the following is a statement of the quantum mechanical model of the atom? (you may choose more than one

• electrons move in orbitals around the nucleus

• electrons move in orbits around the nucleus

• electrons move as both particles and waves

• electrons move in one path and if close to the nucleus get sucked in

Which of the following can be concluded based on research by De Broglie?

• electrons behave as particles only

• electrons behave as waves only

• electrons behave as neither particles nor waves

• electrons behave as both particles and waves

Tags

NGSS.HS-PS4-3

A three dimensional region around the nucleus where there is a high probability of finding an electron is a(n):

• energy level

• nucleus

• orbit

• orbital

The electron configuration of the N^3- ion is:

• 1s²2s²2p³

• 1s²2s²2p²

• 1s²2s²2p⁴3s²

• 1s²2s²2p⁶

The electron configuration of the K⁺¹ ion?

• 1s²2s²2p⁶3s²3p⁶4s¹

• 1s²2s²2p⁶3s²3p⁶

• 1s²2s²2p⁶3s²3p⁶4s²

• 1s²2s²2p⁶3s²4s¹