The relationship P₁/T₁ = P₂/T₂ for a fixed mass of gas at constant volume is known as: MCQ with Answer and Explanation

Explanation:
Metalloids (B, Si, Ge, As, Sb, Te) are located along the staircase line on the right side of the p-block, dividing metals from non-metals. They exhibit intermediate properties: semiconductors, brittle, can form alloys. They are in groups 13-17. The s-block contains reactive metals. Group 18 contains noble gases. f-block contains lanthanides and actinides.

Explanation:
Sodium has the electronic configuration [Ne]3s1. After losing one electron to form Na+, it achieves a highly stable noble gas configuration ([Ne]). Removing a second electron from this stable core requires an exceptionally large amount of energy. Thus, sodium has the highest second ionization energy among these elements.

Explanation:
Covalent compounds generally have low melting and boiling points because the intermolecular forces (van der Waals forces) holding the molecules together are relatively weak compared to the strong ionic bonds in ionic compounds. They are also generally poor conductors of electricity as they lack free ions.