Electrons in Atoms Lesson

Which atom in the ground state has three unpaired electrons in its outermost principal energy level?

• Li

• B

• N

• Ne

Tags

NGSS.HS-PS1-1

What is the total number of valence electrons in an atom with the electron configuration 1s²2s²2p⁶3s²3p³?

• 6

• 2

• 3

• 5

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which atom in the ground state has only 3 electrons in the 3p sublevel?

• phosphorus

• potassium

• argon

• aluminum

Tags

NGSS.HS-PS1-1

The total number of sublevels in the fourth principal energy level of an atom is

• 1

• 2

• 3

• 4

A maximum of 6 electrons can occupy

• an s orbital

• an s sublevel

• a p orbital

• a p sublevel

Which is a correct description of the shape and spatial orientation of the p orbitals in an atom?

• All have the same shape but a different orientation.

• All have the same shape and the same orientation.

• All have a different shape and a different orientation.

• All have a different shape but the same orientation.

What is the total number of orbitals in a d sublevel

• 1

• 3

• 5

• 7

Atoms are neutral because they

• have an equal number of charged and noncharged particles.

• have neutrons in their nuclei.

• have an equal number of electrons and protons.

• have an equal number of neutrons and protons.

An element’s atomic number is equal to its number of

• protons

• neutrons

• valence electrons

• protons and neutrons

Chris the Chemist was working in the lab, and put copper chloride into a Bunsen burner flame. As soon as he put it in the flame, it began to emit a green color. Which of these BEST describes this outcome?

• The heat split the nucleus and created a new element.

• As the copper chloride was heated, electrons were turned into neutrons.

• As the electrons moved to a higher energy level, a photon of light is emitted.

• When excited electrons return back to the ground state, a photon of light is emitted.