Is A bond a chemical attraction between two atoms?

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?

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.

What element has similar physical and chemical properties as boron.