How many total electron will fit in the 1st energy level

2 elections will fill the first energy level

2, only 2 electrons fit in the 1st energy level or ring

For your second question its Diamonds,Rubys, Emeralds.
And for your first question its :Minerals are natural: These substances that form without any human help.

Minerals are solid: They don't droop or melt or evaporate.

Minerals are inorganic: They aren't carbon compounds like those found in living things.

Minerals are crystalline: They have a distinct recipe and arrangement of atoms.