Question

a Quiz Contest was being held in a school for Chemistry students the quiz master set an element was has the electronic configuration 2 8 2 what is atomic number of the element is a is it a metal or nonmetal or metalloid which of the element n g o p o r so similar to the Raman we use a compound of this element in a food identify the compound a compound of this element causes hardness of water identify the compound​

Answer 1

The atomic no. Is 12. It is a metal. It is magnesium. It causes hardness of water

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Answer 2

The atomic number of an element whose electronic configuration is 2,8,7 is 17 and the element is Chlorine. F (Fluorine) shows similarity with this element as both these elements are from the same group that is known as Halogen.

The daily-use compound from this element is NaCl (Sodium Chloride). It is also known as the common salt. The compound Magnesium Chloride (MgCl2) causes hardness of water.