NEET Classification of Elements and Periodicity in Properties — Set 13

Question 1

Which element has the highest third ionization enthalpy among the following?

Accepted Answer

Third ionization enthalpy is highest when removing an electron from a noble gas-like configuration. Mg (after losing two electrons, becomes $\ce{Mg^2+}$ with $1s^2 2s^2 2p^6$) has the highest value.

Question 2

What is the general outer electronic configuration of group 1 elements?

Accepted Answer

Group 1 elements (alkali metals) have one valence electron, with outer configuration $ns^1$.

Question 3

Which element in the fifth period d-block has the highest melting point?

Accepted Answer

In period 5 d-block (Y to Cd), melting point peaks with strong metallic bonding due to maximum unpaired electrons. Mo (group 6, $4d^5 5s^1$) has the highest melting point.

NEET Chemistry: Classification of Elements and Periodicity in Properties — Practice Set 13

Q1. Which element has the highest third ionization enthalpy among the following?

Q2. What is the general outer electronic configuration of group 1 elements?

Q3. Which element in the fifth period d-block has the highest melting point?

Q4. Which oxide of a fourth period element reacts with both acids and bases?

Q5. Which oxide of a group 14 element is predominantly covalent and acidic?

Q6. What is the maximum number of elements in the third period?

Q7. What is the IUPAC name of the element with atomic number 113?

Q8. Which ion among the following isoelectronic species with 18 electrons has the highest polarizing power?

Q9. Which element in the second period forms compounds with maximum covalency of 4?

Q10. Which group 15 element forms a trichloride with the highest covalent character?