How many ions that have a +1 charge will bond with an ion that has a –2 charge?
a.1
b.2
c.3
d.4

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Condensation happens when water vapor cools. true or false? ?

Which scientists contributed to the determination of how cfcs in clouds in the upper atmosphere could destroy ozone molecules