The element with highest electronegativity in modern periodic table ‘X’. The element with highest electron gain enthalpy in modern periodic table ‘Y’. Difference in the atomic numbers of X and Y is equal to - Sri Chaitanya Infinity Learn Best Online Courses for NCERT Solutions, CBSE, ICSE, JEE, NEET, Olympiad and Class 6 to 12

A
valency of noble gases
B
atomic number of most abundant element in atmosphere
C
atomic number of most abundant element in earth's crust
D
valency of alkali metals

Solution:

The element with highest electronegativity in modern periodic table ‘F’ (Z=9). The element with highest electron gain enthalpy in modern periodic table ‘Cl’ (Z=17). Difference in the atomic numbers of X and Y is equal to 8.

Oxygen (Z=8) is the most abundant element in earth's crust.

Solution:

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