Question

Write the electronic configuration of group I elements of the periodic table.

Answer 1

Hint : We know that the electronic configuration determines every single chemical property of an element. Each element, in the ground state, has a unique electronic configuration and hence, each one of them differs from the other.

Complete Step By Step Answer:
As we have seen earlier, the modern periodic table consists of $18$ groups. As we traverse down a group the electronic configuration in groups changes hugely. A new subshell is added to the elements as we traverse down a group. All the elements in a group have similar properties and also have the same valency. The elements belonging to a particular group have several similarities in their chemical properties and also form similar types of bonds, however, there are some exceptions. The electronic configuration of group I elements of the periodic is given by:

Element	Atomic Number	Electronic Configuration
$H$	$1$	$1$
$Li$	$3$	$2,1$
$Na$	$11$	$2,8,1$
$K$	$19$	$2,8,8,1$
$Rb$	$37$	$2,8,18,8,1$
$Cs$	$55$	$2,8,18,18,8,1$
$Fr$	$87$	$2,8,18,32,18,8,1$

Electronic configuration of elements plays a key role in determining their chemical properties. Although electrons are tiny, they practically determine the nature of the elements. They determine the chemical properties of the element- the valency, the ionization potential, the ionization enthalpy, chemical bonding, and almost every single property. The lack of an electron makes the element an electron acceptor, whereas having an excess electron makes it an electron donor. Hence, electronic configuration is a deciding factor like the electron.

Note :
Remember that each atom belonging to every single group and period has a characteristic electronic configuration. This electronic configuration of the elements determines their several properties. It plays a major role in determining the chemical properties of the atoms such as valency, conductance, reactivity.