To form a charge of +2 an atom mustelectrons. To form -3 it must electrons.

Multiple choice:
1) gain2 ;lose 3
2) gain3: lose2
3) lose2;gain3
4) lose3; gain2

Agas is contained in a thick walled balloon when the pressure changes from 1.21 atm to 2.52 the volume changes from 3.75 l to 1.72 l and the temperature change from 293k to blank k

How do scientists think that gravity affected the formation of our solar system?

Which is a chemical property of iron? a. it forms iron oxide (rust) when exposed to moisture and air. b. it is a gray–black metal that is hard to the touch. c. it has a melting point of 2795°f (1536°c). d. it is a good conductor of heat