Question

Electronic configuration of an element is 2,8,1. The atomic number of this element is----and its symbol is ---
Answer :
17​

Answer 1

Answer:

Potassium with atomic number 19 has the electronic configuration (2,8,8,1). So, it can lose one extra electron and can become a positive ion. So, it is metal.

Answer 2

Answer:

This electronic configuration belongs to sodium. Atomic number of this element is 11 and the symbol is Na.

Explanation:

• Sodium belongs to alkali metal family.
• It have atomic mass of 22.990.
• It is a reactive metal.
• It have a metallic lusture but it is soft at room temperature.
• It belongs to group 1 and s- block of periodic table.
• Sodium has a very important commercial importance.It produces sodium hydroxide when it reacts with snow , ice and water.
• It also reacts with ammonia to form sodium amide but it donot react with nitrogen.
• Sodium when reacts with air develops a layer of sodium oxide due to which it loses its silver appearance and develops opaque grey colour layer.
• Common salt or sodium chlroide is formed when sodium reacts with chlorine.

To learn more about sodium chloride from the given link -

https://brainly.in/question/5324435

To learn more about periodic table from the given link-

https://brainly.in/question/267943

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