Question

What is the element with an electron configuration of 1s22s1?

Answer 1

Explanation:

Since we had 3 electrons, we therefore have 3 protons, and the element with atomic number 3. We look up 3 on the periodic table and it is Lithium (Li) .

Answer 2

Answer:

element Silicon

The electron configuration 1s22s22p63s23p2 is the element Silicon.

Since we had 3 electrons, we therefore have 3 protons, and the element with atomic number 3. We look up 3 on the periodic table and it is Lithium (Li) .