D And F Block Elements

Step 1: Define paramagnetism.
Paramagnetism occurs in substances with at least one unpaired electron. These substances are attracted to magnetic fields.
Step 2: Check the magnetic properties of the options.
- CO2 is diamagnetic as it has no unpaired electrons. - ClO2 is paramagnetic as it has unpaired electrons in its molecular orbitals. - SO2 and SiO2 are also diamagnetic.
Step 3: Apply to the options.
Since ClO2 has unpaired electrons, it is the only paramagnetic oxide among the options.
Final Answer:

Step 1: Understand electronic configuration.
The electronic configuration of an atom is the distribution of its electrons among various orbitals. Copper (Cu) has an atomic number of 29.
Step 2: Apply the Aufbau principle.
- The configuration for Copper (Cu) should fill up orbitals starting from the lowest energy level. - However, copper is an exception because it prefers to have a fully filled 3d orbital. This leads to the configuration [Ar] 3d 4s .
Step 3: Apply to the options.
Option (B) is the correct configuration for copper, where the 4s orbital has one electron and the 3d orbital is completely filled.
Final Answer: