Acubic piece of metal measures 2.50 cm on each edge. if the metal is nickel, whose density is 8.90 g/cm3, what is the mass of the cube?

express your answer using three significant figures.

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?

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17

What type of radiation is lead emitting in the following equation? alpha particles beta particles gamma rays