Question

Write the name , symbol and electronic configuration of an element X whose atomic number is $11$ .

Answer 1

As we know that the atomic number of an chemical element is equal to the number of protons in the nucleus . The atomic number identifies a chemical element. This is similar to the charge number of the nucleus.

Complete answer: or Complete step by step answer:
According to the question, the chemical name of element X is sodium because its atomic number is 11.
The Symbol of element X that is sodium is -$Na$.
Sodium: Sodium is a chemical element which is soft, silver whitey. Atomic mass of sodium is $22.990u$which is an alkali metal. $Na$ is an element of the group $1$ in periodic table. It has crystal structure. The most common compound of sodium is sodium chloride. It's known as a common salt. Sodium chloride is used in food and feedstock in chemical industries.
Sodium shows the acid-base property. It's only steady isotope is $^{23}Na$. Sodium is needed for all living things including people. Many humans eat about $10g$of salt but need is about only $3g$. Extra sodium causes high blood pressure.
$Na$ is a necessary electrolyte which helps maintain the balance of water in the cells. Sodium compounds like sodium chloride, hydroxide and carbonate are manufactured annually which is used for anti-icing and de-icing.
Sodium is used as a heat exchanger in many nuclear reactors and as a reagent in chemicals, but sodium salt is more used as metal.
As we know that sodium has $11$ protons. In a neutral molecule the no of protons is equal to the no of electrons, so we can say that $Na$ also has $11$electrons. Thus, the electron configuration can be written, in complete configuration or in the condensed electron configuration.
$Na \to 1s^2$ $3s^2$ $2p^6$ $3s^1$ (complete configuration)
OR
$Na \to \left[ {Ne} \right]3s^1$ (condensed configuration)

Note:
Molecular weight of sodium is $22.989769g/mol$ . Sodium is also used to make electric power cable, sodium lamps.