AP Class Chemistry 02

There are total of -------- elements known to science in periodic table.

• 118

• 121

• 108

• 188

About 3⁄4 of the elements on the periodic table are ________.

• metalloids

• nonmetals

• metals

• gases

Elements on the periodic table are arranged in rows and columns according to their _________.

• properties

• categories

• atomic number

• boiling point

Group 1 metals that react quickly with other elements are ___________.

• metals

• alkaline earth metals

• alkali metals

• nonmetals

___________ are located on the left side of the periodic table.

• Nonmetals

• Gases

• Metals

• Metalloids

Where are electrons of an atom found?

• Nucleus
• Electron Cloud
• Some are in the nucleus and some in the electron cloud.
• They are moving everywhere.

Which of the following elements is Not one of the six most common in living organisms?

• carbon

• oxygen

• iron

• nitrogen

• hydrogen

The are ___ naturally occurring elements.

• 57

• 108

• 95

• 92

• 87

Which statement is Not true about subatomic particles?

• Protons are found in the nucleus.

• Neutrons have no electrical charge.

• Electrons contain much less mass than neutrons.

• Electrons are found in orbitals around the nucleus.

• All electrons in an atom contain the same amount of energy.

CO₂ is an example of a(n) _____ bond.

• covalent
• adhesive
• ionic
• cohesive