The principle quantum number "n" represents the relative overall energy of each orbital, and the energy of each orbital increases as the distance from the nucleus increases. The sets of orbitals with the same "n" value are often referred to as electron shells or energy levels.
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Answer: 
Explanation:
Multiply by t on both sides.
Now divide by I to isolate t.
Answer:
Lithium Fluoride
Explanation:
It should be lithium fluoride for sure :)
Mole is equal to mass of the element divided by molar mass of the element. that is
mole=mass/molar mass
From periodic table calcium has a molar mass of 40 g/mol
moles is therefore =800g/40g/mol=20moles
