Question

Match the elements of given atomic number with their properties.

	Column I		Column II
P	11	1	IE is maximum
Q	19	2	Alkali metal
R	37	3	Largest size
S	55	4	Position next to $Kr$

• A. $P-1:Q-1,2:R-1,2:S-3,4$
• B. $P-1,2:Q-2,4:R-2,4:S-2,3$
• C. $P-1,2:Q-2,:R-2,4:S-2,3$
• D. $P-2,3:Q-1,2:R-2,4:S-2,3$

Answer 1

The correct option is C $P-1,2:Q-2,:R-2,4:S-2,3$

Atomic number of $Na$ is 11 and atomic number of $K$ is 19. Both are alkali metals present in group I.
$Na$, atomic number 11, has the highest ionization energy due to the lowest ionic radius among the four. As we move down the group, ionization energy decreases as size increases.
Element with atomic number 55 has the largest atomic size. As we move down the group atomic size increases.
Element with atomic number 55 is an alkali metal and has the largest size in given elements.
Element with atomic number 37 is next to Krypton as its atomic number is 36.