Chemistry · CHEMICAL BONDING AND MOLECULAR STRUCTURE

Consider the following statements regarding chemical bonds and bond parameters: (A) Most ionic compounds consist of cations derived from metallic elements, but the ammonium ion (\( \text{NH}_4^+ \)) is an exception as it is made of non-metallic elements. (B) Noble gas compounds such as \( \text{XeF}_2 \) and \( \text{KrF}_2 \) demonstrate that the octet rule is not universally valid. (C) The covalent radius of chlorine is equal to \( 198\text{ pm} \). (D) The van der Waals radius represents the overall size of the atom which includes its valence shell in a nonbonded situation. Choose the correct answer from the options given below:

1. (A) and (C) only
2. (A), (B) and (D) only
3. (A), (B) and (C) only
4. (B) and (C) only