8. what atom is a noble gas in group 18, row 4?

a. ar
b. kr
c. ne
d. rn

the answer is B:  Kr

Explanation:

just FYI...I inserted the chart as well

a. as the temperature increases, the kinetic energy of the gas molecules increases & the molecules move faster & further away from each other.

b. if you decrease the temperature of a fixed amount of gas at constant pressure, the combined gas law reduces to charles's law. in this case, volume will also decrease.

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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