Question

What element is in period 4 group 7?

Answer 1

Hint : In the periodic table, the vertical columns are known as groups and the horizontal rows are known as periods. Members of the same group in the table consist of the same number of the electrons in their outermost shell while the periods correspond to the relationship of orbitals or likely areas in which electrons will be found.

Complete Step By Step Answer:
In the modern periodic table, the group 7 consists of manganese (Mn), technetium (Tc), rhenium (Re) and bohrium (Bh). The general electronic configuration of group 7 elements is $(n - 1){d^5}n{s^2}$, where n represents the period of the respective element. All the elements consist of partly filled d-orbitals and thus are considered as transition metals and have a tendency to exist in variable oxidation state.
Now, manganese is the first element of group 7 with atomic number 25. It is the only common element in group 7 with the fifth largest abundance in the earth’s crust of any metal. The electronic configuration of manganese is represented as follows:
$Mn = [Ar]3{d^5}4{s^2}$
As the value of n for manganese is 4 that means it belongs to the fourth period of the periodic table. Thus, we can conclude that the element which belongs to period 4 group 7 is manganese.

Note :
Ensure not to get confused between group 7 and group 7A, as group 7 is the group of transition metals while group 7A is the group consisting of halogens. The group of halogen family is known as 7A because of the presence of seven electrons in the outermost shell of atoms.