Barium, it's an earthy alkaline metal it's atomic number is 56
The answer is A. A mole of Cu has the same number of atoms as a mole of He atoms
I’m pretty sure it’s D.increases the activation energy for a reaction.
Answer : It is only one of those ancient sights which still exist and gives ancient antiquity to the great pyramid in Egypt. It is believed that the pyramids are the definition of prayers that still remains in the heart of the local people.
It is also one of seven wonders of the world that is under world heritage. Pyramids where only found in Egypt and nowhere else.
