June 9 SI Session

What is the atomic number for an ion that has a charge of+ 1 and contains 18 electrons?

• 17

• 18

• 19

• 20

• A

• B

• C

• D

Which group number contains the most diatomic molecular elements?

• Group 1

• Group 16

• Group 17

• Group 18

What is the classification of sulfur?

• Metal

• metalloid

• semiconductor

• nonmetal

Which element is represented by ⁵⁶₂₄X?

• iron

• germanium

• barium

• chromium

Magnesium forms an ionic compound with an element with the formula MgX. Which ion could be X?

• Br^-

• P^3-

• C^4-

• S^2-

• A

• B

• C

• D

• A

• B

• C

• D

A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 6.1 mL. If the metal weighs 8.7 g, what is the density of the metal in g/mL?

Some liquid in a jar can be separated by physical means into two separate liquids, which can then be separated no further. The liquid is a(n):

• A) Compound

• B) Element

• C) Mixture

• D) Pure substance