Which of the following ions is a polyatomic ion?
(points : 1)
f

ca2+

nh4+

cl

How many ions that have a +1 charge will bond with an ion that has a -2 charge

How does a scientist the government? a. the scientist tells people in society what to do. b. the scientist determines the policies that the government spends money on. c. the scientist provides unbiased information to the government. d. the scientist makes laws based on his or her research results.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?