Verified Answer :

Hagrid

Which of these elements has an electron configuration of
[Kr]5s2?

The element
that has an electron configuration of [Kr]5s2 is strontium. The rest of the
given choices do not answer the question above.

Blitztiger

Given this abbreviated electron configuration, we begin from the row of the periodic table that contains Krypton (Kr). Then since the remaining electrons are 5s2 (which indicates 2 electrons in the 5s orbital), we check the next row (the 5th row) and find the 2nd element, which would contain two electrons. The first element is rubidium, while the second is strontium, so this means that Sr is the final answer.

Related Questions