Ablock of metal has a width of 3.2 cm, a length of 17.1 cm, and height of 4.2 cm . its mass is 1.1 kg . calculate the density of the metal.

What is the most stable monatomic ion formed from nitrogen

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?

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons