Bio 2 Final

Ionic bond form between two or more

• Molecules

• compounds

• cations

• ions

Which of these regions of the periodic table will have the least reactive elements?

• Left column

• middle column

• right column

• bottom row

What is an atom with an unfilled outer shell likely to do with other atoms?

• dissociate

• intermingle

• react

• repel

How many naturally occurring elements are there?

• 71

• 92

• 103

• 118

Of the group of elements below, which are most likely to gain electrons to become anions

• Alkali Metal

• Boron Group

• Halogen

• Transition Metal

What type of bond occurs between atoms with similar electronegativities?

• Hydrogen

• Ionic

• nonpolar covalent

• polar covalent

Why do polar covalent bonds result in partial charges on either end of the bond?

• Electrons are pulled toward the more electronegative atom.

• Electrons are pushed away from the more electronegative atom.

• Electrons are shared only with the electronegative atom

• Electrons are transferred to the more electronegative atom

Which of the following exerts the greatest influence on holding electrons of a helium atom in their shells?

• electromagnetic force

• gravitational force

• hydrophobic attraction

• magnetic pull

Carbon-12 and carbon-14 are two isotopes of carbon that have different numbers of neutrons. Which of the following properties would you expect to be different between carbon-12 and carbon-14?

• electrical charge

• atomic mass

• chemical properties

• all of the above

Magnesium (a metal) and oxygen (a nonmetal) combine to form magnesium oxide (MgO). The atoms are held together by strong electrostatic attractions between the positive and negative charges of the atoms. Which type of bond holds these atoms together?

• Covalent

• Hydrogen

• ionic

• polar covalent