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Which element is classified as an alkali metal?

• Rb

• Sr

• Cr

• Cl

Which element is most electronegative?

• Fluorine

• Chlorine

• Hydrogen

• Francium

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is the correct electron configuration of Chlorine?

• [Ne] 3s2,3p5

• [Ne]1s2,2p6

• [Ne]1s2,2s2

• [Ne]1s2,2p2

Who is the father of the Periodic Table?

• Dalton

• Mendeleev

• Einstein

• Bill Nye

Identify the property that is not a physical property of matter.

• color

• tendency to rust

• boiling point

• density

Which of the following is classified as a pure substance?

• Sand

• Soda

• Plastic

• Chlorine

The part of the electromagnetic spectrum that humans can see is the ____________.

• Visible spectrum

• Infrared spectrum

• Ultraviolet spectrum

• a, b, and c

The valence orbitals in an atom are the ___________.

• Innermost orbitals

• Second energy level

• d orbitals

• Outermost orbitals

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following types of electromagnetic radiation has the least energy?

• UV

• X-rays

• Gamma rays

• Radio waves

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NGSS.HS-PS4-4

Hydrogen has three isotopes Hydrogen - 1, hydrogen - 2, hydrogen - 3. What is the difference between these three isotopes?

• The number of protons ranges from 1 to 3

• The number of electrons ranges from 1 to 3

• The number of neutrons ranges from 0 to 2

• The number of protons ranges from 0 to 2