NEET Classification of Elements and Periodicity in Properties — Set 3

Question 1

Which group contains only p-block elements?

Accepted Answer

p-block spans groups 13–18. Options: (1) Na (group 1), Mg (group 2) → s-block; (2) B (group 13), C (group 14) → p-block; (3) Li (group 1), Be (group 2) → s-block; (4) K (group 1), Ca (group 2) → s-block.

Question 2

Which ion among the following isoelectronic species with 36 electrons has the largest radius?

Accepted Answer

For isoelectronic species (36 electrons), radius increases with decreasing nuclear charge. $\ce{Br^-}$ (Z=35) has the largest radius compared to $\ce{K+}$, $\ce{Ca^2+}$, or $\ce{Sc^3+}$.

Question 3

Which element in the fourth period has the highest metallic character?

Accepted Answer

Metallic character decreases across a period and increases down a group. In period 4, K (group 1) has the highest metallic character compared to Ca, Sc, or Ti.

NEET Chemistry: Classification of Elements and Periodicity in Properties — Practice Set 3

Q1. Which group contains only p-block elements?

Q2. Which ion among the following isoelectronic species with 36 electrons has the largest radius?

Q3. Which element in the fourth period has the highest metallic character?

Q4. The atomic radius of which element is the largest among the following?

Q5. Which element has the electronic configuration \(1s^2 2s^2 2p^6 3s^2 3p^2\)?

Q6. Which element in the fifth period has the highest electronegativity among p-block elements?

Q7. Which group 16 element has the highest tendency to form stable compounds in the +4 oxidation state?

Q8. Which ion among the following has the highest effective nuclear charge for an isoelectronic series with 10 electrons?

Q9. Which group 17 element exhibits the least reactivity with hydrogen due to its bond strength?

Q10. Which pair of elements from different groups shows the closest similarity in ionization enthalpy?