The first shell can have either one or two electrons, no more than that.2 the first shell is 1s2
the first shell hods 2 the second shell holds 8 the third shell holds 8 the forth shell holds 16 if u look at the table it is however many are in the horizontal row
A carbon has 2 electrons in it's first electron shell.
Only two.
15
Most often, two.
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