Write the name and symbol of the element from the description:

a. The atom having the smallest size:
→ The atom having the smallest size is 2He. (The atomic radius of He is 31 pm) 1 Mark
b. The atom having the smallest atomic mass:
→ The atom having the smallest atomic mass is 1H. 1 Mark
c. The most electronegative atom:
→ The most electronegative atom is 9F. [Fluorine (2,7) has the highest tendency to accept electron to achieve noble gas configuration (2,8)] 1 Mark
d. The noble gas with the smallest atomic radius:
→ The noble gas with the smallest atomic radius is 2He. 1 Mark
e. The most reactive nonmetal:
→ The most reactive nonmetal is 9F 1 Mark