An atom had a mass of 43 and it also has has 21 electrons

The minerals found in bones are deposited by living cells called

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?