Benchmark #2 Review

What is the small number behind an element called in a chemical formula?

• A subscript

• A coefficient

• A superscript

• A prefix

How many atoms of hydrogen are there in this water molecule?

• 1

• 2

• 3

• 4

What is the big number in front of a compound called in a chemical formula?

• A subscript

• A coefficient

• A superscript

• A prefix

What does the big number in front of a compound tell us about the compound?

• The number of molecules

• The number of atoms

• The charge of the compound

• The mass of the compound

When there is a parenthesis and a subscript outside it, what must you do with that subscript?

• Ignore the subscript

• Add the subscript to the ones inside the parentheses

• Multiply the subscripts that are outside with the ones inside the parentheses

• Divide the subscripts that are outside with the ones inside the parentheses

Which subatomic particle is not present in the nucleus of an atom?

• Proton

• Neutron

• Electron

• Quark

What is the maximum number of valence electrons in the elements shown in Group 18?

• 2

• 8

• 18

• 32

Based on the periodic table excerpt and the diagrams, which element has the smallest atomic radius (least amount of energy levels or shells)?

• Helium (He)

• Neon (Ne)

• Argon (Ar)

• Xenon (Xe)

How can you determine the number of valence electrons for the elements in Group 1?

• Count the number of shells.

• Count the number of protons.

• Look at the group number.

• Count the number of neutrons.

What are the reactants in the chemical equation shown?

• Sugars and Oxygen

• Carbon dioxide and Water

• Chlorophyll and Sugars

• Sun's energy and Oxygen