1s2 2S2 SP5

Question

1s² _2s² 2p5 what element is represented by the electron configuration

Answer 1

Here I assume you have only the basic periodic table which doesn't mention electron configurations.

1s² 2s² 2p⁵

This reads that there are 2 electrons in the 1s subshell, 2 electrons in the 2s subshell, and 5 electrons in the 2p subshell. This is a total of 2+2+5 = 9 electrons. So for a neutral atom, we must have Z=9.

Flourine has atomic number 9.

Answer 2

Flourine :)

Using the periodic table helps

this webpage of a periodic table with the electron configurations may help you http://chemwiki.ucdavis.edu/@api/deki/files/4226/=PeriodicTable2.jpg

Good luck!