(i) How many electrons arc present in the valence shell of the element with atomic number 18?

Question

 With reference to the first three periods of the modern periodic table, answer the questions given below:

(i) How many electrons arc present in the valence shell of the element with atomic number 18? 

(ii) What is the electronic configuration of the element in the third period which gains one electron to change into an anion? 

(iii) What is the name given to the energy released when an atom in its isolated gaseous state accepts an electron to form an anion? 

(iv) What type of bonding will be present in the oxide of the element with atomic number 1?

Answer 1

(i) Eight 

(ii) 2, 8, 7 

(iii) Electron affinity 

(iv) Covalent bonding