Question

Use the periodic table to identify the element with the following electron configuration:A. 1s2 2s2 2p6 3s2 enter the symbol of the elementB. Krypton 5s2 4d6 enter the symbol of the elementC. How many unpaired electrons are present in a ground-state atom from the halogen family: enter a number, such as 0, 1, 2, etcD. unpaired electrons in the 5A column: enter a number, such as 0, 1, 2, etcE. unpaired electrons in the 6B column enter a number, such as 0, 1, 2, etc

Answer 1

I can only answer 2 of the problems since the direction of the rest are confusing/unclear.
A) Magnesium (Mg)
B) Ruthenium (Ru)