Question

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

Answer 1

Hint: 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.