Lewis Structure and Chemical Bonding-I

Front

What is a Lewis dot structure?

Back

A Lewis dot structure is a diagram that represents the valence electrons of atoms within a molecule, showing how they are arranged among the atoms and indicating bonds and lone pairs.

Front

How many valence electrons does fluorine (F) have?

Back

Fluorine has 7 valence electrons.

Front

What is the Lewis dot structure for the molecule F2?

Back

The Lewis dot structure for F2 shows two fluorine atoms, each with 7 valence electrons, sharing one pair of electrons to form a single bond.

Front

How many lone pairs are present in the ammonia (NH3) molecule?

Back

Ammonia (NH3) has 1 lone pair on the nitrogen atom.

Front

What is electronegativity?

Back

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.

Front

Which molecule is the most polar: H-I, H-Cl, H-Br, or H-F?

Back

H-F is the most polar molecule due to the highest difference in electronegativity between hydrogen and fluorine.

Front

What is an expanded octet?

Back

An expanded octet refers to a situation where an atom has more than eight electrons in its valence shell, typically seen in elements from the third period and beyond.

Front

Which of the following molecules has a central atom with an expanded octet: PF5, SF6, XeF4?

Back

All of the above (PF5, SF6, XeF4) have central atoms with expanded octets.

Front

What is the Lewis structure for BF3?

Back

The Lewis structure for BF3 shows boron in the center with three fluorine atoms bonded to it, and no lone pairs on boron.

Front

What is the significance of lone pairs in Lewis structures?

Back

Lone pairs in Lewis structures represent non-bonding valence electrons that can influence molecular shape and reactivity.