The redox reaction is

Here
Calcium undergoes reduction, and acts as cathode
Lithium undergoes oxidation and acts as anode
The reduction potential of calcium is -2.87 V
The reduction potential of lithium is - -3.05 V
We know that
Ecell = Ecathode - Eanode
Ecell = -2.87 - (-3.05) = 0.18 V
It affects our everday life because of new inventions and easier ways to make/produce different stuff!
Answer: A boron atom has 2 electrons at the first energy level and 3 electrons at the second energy level.
Magnesium