Unit 1 Assessment Review

Some students conducted a laboratory investigation to learn more about the physical properties of different elements. They observed four samples and recorded their observations in the table below.

Based on these observations, which sample is most likely a nonmetal?

• Sample 1

• Sample 2

• Sample 3

• Sample 4

Which of the following is a good conductor of thermal energy?

• Nonmetal

• metal

• Metalloid

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

How many valence electrons are in an atom of each element in Group 17 on the periodic table?

• 5

• 3

• 7

• 17

How many valence electrons are in an atom of each element in Group 2 on the periodic table?

• 12

• 2

• 20

• 4

Metals are dull and brittle.

• True

• False

Metals can be stretched into thin wires (ductile).

• True

• False

Which element has chemical properties that are most similar to the chemical properties of aluminum, Al ?

• Hydrogen, H

• Oxygen, O

• Beryllium, Be

• Boron, B

Students collected data on five elements. Their data are shown in the table.

Which element has the same number of energy levels as sodium?

• Lithium

• Magnesium

• Beryllium

• Potassium

Which pair of elements are nonmetals and gases at room temperature and normal atmospheric pressure?

• Nickel, N and Copper, Cu

• Silicon, S and Germanium, Ge

• Nitrogen, N and Neon, Ne

• Potassium, K and Calcium, Ca

The atoms of elements belonging to the same group in periodic table have the same :

• number of protons

• number of neutrons

• number of electrons

• number of valence electrons