What element has the electron configuration of 1s2 2s2 2p6 3s2 3p5?

Answer 1

That element is chlorine (Cl). You can tell for two reasons: first, the second number in each section (which, when properly written, is a superscript) should all add up to the element's atomic number. Another reason is that the configuration ends in 3p5, which tells you that the element is in period 3, and it's one spot back from the noble gas, which automatically will end in 3p6. The noble gas is argon (Ar), so the element in question must be chlorine.

Answer 2

The element magnesium has this electron configuration. Magnesium is a metal with the chemical symbol Mg. It is a solid at room temperature and has an atomic number of 12.

Answer 3

it is chlorine 1s2 2s2 2p6 3s2 3p5 or Cl [3s2 3p5]

Answer 4

2s3 does not exist.

However, if you meant 1s22s22p63s2, then the element is Magnesium.

Answer 5

The element with the electron configuration of 1s2 2s2 2p6 3s2 3p5 is chlorine (Cl). It has 17 electrons in total, with 7 electrons in the 3p orbital.

Answer 6

Chlorine (Cl)

Answer 7

Fluorine.

Answer 8

Sulfur