Name the elements present in the second period. Give their electronic configuration.

Give and justify electronic configurations of Cr.

Give and justify electronic configurations of Cu

Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element.

Name the central element present in chlorophyll.

How many elements are present in 4th period?

Predict the position of the element in periodic table have the electronic configuration (n-1)d1 ns2 n=4

Give the electronic configuration of carbon atom?

Name the element with electronic configuration 1s2

Which element has the electronic configuration 2,2?