Which of the following has three electrons in its valence shell?
carbon,
aluminum,
sodium,
calcium

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

Which phrase best defines a mountain eee