Thallium is known for forming a stable +3 oxidation state.

Aluminum commonly forms stable +3 oxidation state compounds.

Neodymium (Nd) and Plutonium (Pu) are both f-block elements.

D-Glucose and L-Glucose are mirror images of each other, making them enantiomers.

Lanthanum (La) and Cerium (Ce) are both f-block elements, belonging to the lanthanide series.

1-pentanol and 2-pentanol differ in the position of the hydroxyl group, making them structural isomers.

Complementary angles are two angles whose sum is 90 degrees. All the given pairs meet this criterion.

Adjacent angles are defined as angles that share a common vertex and a common side.

Adjacent angles are defined as angles that share a common vertex and a common side.

Supplementary angles are two angles that add up to 180 degrees. An acute angle (less than 90 degrees) and an obtuse angle (more than 90 degrees) can add up to 180 degrees.

C and N will form a bond with the highest bond order of 3, as seen in the molecule CN.

C and N will form a stable diatomic molecule as they have suitable bond orders and electron configurations.

D-Glucose and L-Glucose are mirror images of each other, making them enantiomers.

C2H6 (ethane) and C2H5OH (ethanol) have different functional groups, making them functional isomers.

Cis-2-butene and trans-2-butene differ in the arrangement of groups around the double bond, making them geometric isomers.

Ethyl alcohol (ethanol) and dimethyl ether have the same molecular formula but different structures.

Cerium (Ce) and Lanthanum (La) are both f-block elements.

Cerium (Ce) and Lanthanum (La) are both lanthanides, which are f-block elements.

The first pair has the same slope (2/3) and thus represents parallel lines.

The first pair represents parallel lines, which means they will never intersect, hence no solution.

N2 and CO both have a bond order of 3.

All pairs have the same remainder when divided by 6: 8 mod 6 = 2, 14 mod 6 = 2; 10 mod 6 = 4, 16 mod 6 = 4; 12 mod 6 = 0, 18 mod 6 = 0.

The LCM of 4 and 9 is 36.

The HCF of 15 and 28 is 1, making them coprime.

The HCF of 12 and 18 is 6, as both numbers are divisible by 6, while the other pairs have higher HCFs.

The GCF of 15 and 28 is 1, making them coprime, while the other pairs share common factors.

The electron is the only particle listed that has a negative charge.

The electron has the least mass compared to protons and neutrons.

The mass of an electron is significantly less than that of protons and neutrons.

The electron has the least mass compared to protons and neutrons.