Question

What element is represented by this electron configuration: 1s 2s2 2p4?

a. carbon
b. calcium
c. chromium
d. sulfur
e. oxygen

Answer 1

e. Oxygen

Step-by-step explanation:

Oxygen has 8 electrons. 1s²2s²2p⁴ (by adding up the supercripts–you have 8 electrons and oxygen represents that) [refer to a periodic table -- atomic number]