On the periodic table, the elements known as noble gases are all found in period 2. period 6. group 15. group 18.

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?

Quiz1. which physical state of nitrogen has the highest entropy? a solid© b gasoc liquid

Write a balanced equation showing the formation of copper (ii) nitrite from its elements