NEET Classification of Elements and Periodicity in Properties — Set 19

Question 1

Which d-block element in period 4 has the highest density?

Accepted Answer

In period 4 d-block (Sc to Zn), density increases with atomic mass and decreases with volume. Cu (group 11) has the highest density due to its compact structure.

Question 2

Arrange Be, Mg, Ca in order of increasing atomic radius.

Accepted Answer

Atomic radius increases down a group due to additional electron shells. For group 2: Be < Mg < Ca.

Question 3

Which element forms an acidic oxide predominant in group 15?

Accepted Answer

Group 15 elements form acidic oxides, especially higher oxides. P forms $\ce{P2O5}$, which is acidic, unlike Be (basic), Ca (basic), or Zn (amphoteric).

NEET Chemistry: Classification of Elements and Periodicity in Properties — Practice Set 19

Q1. Which d-block element in period 4 has the highest density?

Q2. Arrange Be, Mg, Ca in order of increasing atomic radius.

Q3. Which element forms an acidic oxide predominant in group 15?

Q4. Which element in the third period has the highest fourth ionization enthalpy?

Q5. Which ion among the following isoelectronic species with 10 electrons has the lowest ionic radius?

Q6. Which element in group 15 has the highest electronegativity?

Q7. Which element has the ground state electronic configuration \(1s^2 2s^2 2p^6 3s^2 3p^6 3d^3 4s^2\)?

Q8. Which of the following is a chalcogen?

Q9. Which group 17 element forms the strongest hydrogen bonds in its hydride?

Q10. Which element in the third period has the highest second ionization enthalpy?