CH4 has a tetrahedral shape due to the sp3 hybridization of the carbon atom.

PCl5 has five bonding pairs and no lone pairs, resulting in a trigonal bipyramidal geometry.

BF3 has a trigonal planar geometry due to sp2 hybridization of boron.

Chromium (Cr) has an electronic configuration of [Ar] 4s1 3d5, which means it has an incomplete d-subshell.

C2H2 has sp hybridization, with a triple bond between the two carbon atoms.

Argon has 18 electrons, and its electronic configuration is 1s2 2s2 2p6 3s2 3p6.

Bromine (Br) has the atomic number 35, and its configuration ends in 4p5.

The element with the configuration [Kr] 5s2 4d10 5p5 is Astatine.

The configuration [Kr] 5s2 4d10 5p5 corresponds to Astatine.

Mercury (Hg) has the electronic configuration [Xe] 4f14 5d10 6s2.

Bismuth (Bi) has the electronic configuration [Xe] 6s2 4f14 5d10.

Water has the highest boiling point due to strong hydrogen bonding between its molecules.

N2 has the highest bond order of 3 among the given options.

Fluorine has the highest electronegativity of all elements.

The configuration 1s2 2s2 2p6 3s2 3p5 (Chlorine) has the highest energy due to the presence of an unpaired electron.

Selenium (Se) has the highest energy electron in the 4p subshell with the configuration [Ar] 4s2 3d10 4p4.

CO2(g) has a higher enthalpy of formation compared to the elements in their standard states.

Steam has the highest entropy at 25°C because it is in the gaseous state, which has more disorder compared to solid (ice) and liquid (water).

Water vapor has the highest entropy because gases have greater disorder compared to liquids and solids.

Water vapor has the highest entropy due to its gaseous state, which has more disorder compared to solids and liquids.

Water vapor at 100 °C has the highest entropy due to its gaseous state, which has more disorder compared to the liquid and solid states.

Magnesium has the highest first ionization energy among the given elements.

CaCl2 dissociates into 3 ions (Ca2+ and 2 Cl-), resulting in the highest freezing point depression.

Silicon (Si) has the highest ionization energy among the given elements due to its higher nuclear charge and smaller atomic radius.

H2O(l) has a higher standard molar entropy than the diatomic gases due to its molecular complexity and interactions.

0.045 has only 2 significant figures.

F2 has the lowest bond energy due to the repulsion between the lone pairs on the fluorine atoms.

He2 has a bond order of 0, calculated as (2 bonding electrons - 2 antibonding electrons)/2 = 0.

The 0.1 M NaCl and KCl solutions will have lower vapor pressures than pure water due to the presence of solute particles.

The solid sphere has the smallest moment of inertia compared to the other shapes for the same mass and radius.