Energy level diagram for ni2+. why the electrons are taken from s orbital but not d orbital?

Iknow #2 is d. i just need to know why

How many electrons does silver have to give up in order to achieve a sido noble gas electron configuration

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.