Question

1. which of the following describes a covalent bond? (1 point) *

the neutrons in one atom is attracted to the protons of another atom. this attraction causes a strong bond to form between the two atoms.
the electronegativity of one atom is much greater than the electronegativity of the other atom, causing the removal of an electron from one atom by the other.
the nucleus of one atom attracts the electrons of the other atom, and they share one or more pairs of electrons.
the nuclei of the material is immersed in a sea of delocalized electrons. the positive nucleus and the negative \sea\ holds the material together.

1. the common name of sii4 is tetraiodosilane. what is its molecular compound name? (1 point) *

silicon iodide
silane tetraiodide
silicon tetraiodide
silane tetraiodine

Explanation:

Question 1

To determine the correct description of a covalent bond, we analyze each option:

• Option 1: Neutrons and protons attraction is not related to covalent bonding (covalent bonds involve electrons). Eliminate.
• Option 2: This describes an ionic bond (electron transfer due to large electronegativity difference). Eliminate.
• Option 3: Covalent bonds involve the sharing of electron pairs between atoms, where each atom's nucleus attracts the shared electrons. This matches the definition.
• Option 4: This describes metallic bonding (sea of delocalized electrons). Eliminate.

For naming molecular compounds (covalent compounds), we use prefixes for the number of atoms. The formula is $\ce{SiI4}$.

• The first element is silicon (no prefix as there's 1 Si atom).
• The second element is iodine, and since there are 4 iodine atoms, we use the prefix "tetra-" and change the suffix to "-ide" (so "iodide").
• So the name is silicon tetraiodide.

Answer:

The option: "The nucleus of one atom attracts the electrons of the other atom, and they share one or more pairs of electrons."

Question 2