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1s2 2S2 SP5

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2 Answers

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.