An element has the electronic configuration 2 , 8 , 7
(a) What is the atomic number of this element ?
(b) We daily use a compound of this element in our food . What is that ?
(c) A compound of this element causes hardness of water . What is that ?

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Solution

a. Chlorine is that element. 17 is the atomic number
b. Sodium chloride -common salt - NaCl is used daily in our food
c. Hardness is produced due to CaCl₂ and MgCl₂

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