Question

The group number of the element with atomic number $37$ is:

Answer 1

We know that the foremost reactive elements are the one that has only a few electrons within the outermost valence shell so alkali metals and alkaline-earth metal metals are highly reactive.

Complete step by step answer:
We know that the electrons within the outermost shell are called valence electrons and therefore the number of electrons it accepts or donates to make a bond is named the valency of an electron. If the outermost shell isn't filled then to fill the outermost shell, it accepts or donates electrons between other atoms.
The number of valence electrons of an atom determines the situation of a component within the table. The electronic configuration of a component with number $37$ is $1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}4{s^2}3{d^{10}}4{p^6}5{s^1}$ the number of electron s is one and therefore the group with one valence electron is alkaline metal. Therefore, the element may belong to the group 1 or 1A.

Note:
Now we can discuss about the representative elements:
Representative elements are the chemical elements within the group-1, group-2 and within the groups from 13 to 18. Representative elements also are referred to as group-A elements or s-block elements and p-block elements or main group elements.
S-block elements have their valence electrons within the outermost s-orbitals and are in two types as alkali metals and alkaline-earth metal metals. Alkali metals are group-1 whereas alkali earth metals are group-2 elements.
P-block elements have their valence electrons within the outermost p-orbitals. Most p-block elements are non-metals including some metalloids.
Most of the compounds formed by representative elements are colorless.
Now we can discuss about the transition elements:
Transition elements are chemical elements that have unpaired d electrons a minimum of during a stable cation.
Transition elements are within the groups 3 to 12.
All the compounds formed by transition elements are colorful.