Ch 5 Review Games Part 2: Question Preview (ID: 16924)

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A member of the boron family has three valence electrons, while a member of the nitrogen family has
a) 5
b) 4
c) none

One twelfth the mass of a carbon-12 atom is used to define a(n)
a) atomic mass
b) atomic mass unit
c) atomic number

The atomic mass of an element is
a) a weighted average of the masses of an element's isotopes
b) a ratio based on the mass of a carbon-12 atom
c) twice the number of protons in one atom of an element

Atoms of the most reactive elements tend to have
a) eight valence electrons
b) one or seven valence electrons
c) four or five valence electrons

Compared with Group 2A elements, group 6A elements have
a) more valence electrons
b) more atoms in the ground state
c) more isotopes

Moving from left to right across a row of the periodic table, which of the following values increases by exactly one from element to element
a) mass number
b) atomic number
c) atomic mass unit

As you move from left to right across a period, the number of valence electrons
a) increases and then decreases
b) decreases
c) increases

Which element is found in most of the compounds in your body except for water
a) potassium
b) iodine
c) carbon

Two highly reactive elements in period 2 are the metal lithium and the
a) nonmetal flourine
b) nonmetal krypton
c) metalloid arsenic

The unit for atomic mass is
a) amu
b) pound
c) gram
d) none of the above

Among the alkali metals, the tendency to react with other substances
a) increases from top to bottom within the group
b) does not vary among the members of the group
c) decreases from top to bottom within the group

At room temperature, none of the metals are
a) gases
b) liquids
c) soft

Which of the following gases emit colors when an electric current is applied?
a) argon and krypton
b) hydrogen and helium
c) oxygen and nitrogen

The tendency of an element to react is closely related to
a) its atomic mass
b) the number of valence electrons in atoms of the element
c) the ratio of protons to neutrons in atoms of the element

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