Question

an element having electronic configuration 2 8 1. Now answer the following questions. 1) atomic number of this elemnt. 2) group of this element .3) to which period this Element belongs​

Answer 1

Explanation:

For this element, the no. of valence electrons =2, valency =2 and as it is metal it belongs to the s-block. The element which belongs to the 3rd period and group 2 is Magnesium. Therefore, we can conclude that the correct answer to this question is option D.

Answer 2

An element having the electronic arrangement of 2, 8, 1 is the metallic element Sodium (Na).

• The atomic number of this element is 11
• This element, that is, Sodium, belongs to group I of the periodic table. This group consists of Alkali metals, all with a valency of 1. It is a cation that attains a positive charge on losing one electron from its outer shell
• The period to which Sodium belongs is Period 3. This consists of 8 elements in total, including Sodium, Magnesium, Aluminum, Silicon, Phosphorous, Sulphur, Chlorine, and Argon
• It is a very reactive metal, having a strongly exothermic reaction when exposed to water

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