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The key to determining the shapes of molecules is to think about number of lone and bonded pairs of elections and the interactions between these pairs. In doing this we apply the valence-shell election-pa...

The atomic mass is made up of all the protons and neutrons (which together form the nucleus) which each have a mass of approx. 1g. Therefore if the mass of the element is 19g and it has 9 protons (proton ...

Cao

Cao + H20 --> Ca(OH)2 

(ASSISTED WITH DIAGRAMS)

The electrons of a molecule are constantly moving around it in charge clouds, meaning that at any one point in time, the molecule's electrons could be more likely on one si...

Avogrado's constant = 6.02214086 × 10²³ mol^{-1 2.5/6.02=0.415 Ar of N = 14 Mr of N2 = 28 28 x 0.415=11.62}