The following electron configuration notation represents an atom of which element? 1s22s22p63s23p2
Answer choice:
A:si
B:be
C:Al
D:H

Si

Explanation:

you can add the exponents 2+2+6+2+2= 14 electrons since it is an atom (no charge) then it also would be the number of protons, tells you it is Si.

answer; i believe the correct answer is (c) /// is a homogeneous mixture of gaseous substance nitrogen,oxygen and smaller amounts of other substancesmixtures can be either ( homogeneous or heterogeneous)plz check first good luck

i believe it is 40–40–20%

explanation: