Question

How many pairs of valence electrons do the bromine atoms have in the following molecules and ions.

1. BrF
2.BrF+2
3.BrF+6
4.BrF−2
5. BrF5

Answer 1

The number of pairs of valence electrons depends on the charge and the number of atoms in the molecule or ion.

Step-by-step explanation:

1. In BrF, the bromine atom has 7 valence electrons, while the fluorine atom has 7 valence electrons. Therefore, the total number of pairs of valence electrons in the molecule is 1.

2. In BrF+2, the bromine atom still has 7 valence electrons, but it has gained 2 electrons to form a cation. So, the total number of pairs of valence electrons is still 1.

3. In BrF+6, the bromine atom has gained 6 electrons to form a cation, resulting in a total of 6 pairs of valence electrons.

4. In BrF-2, the bromine atom has gained 2 electrons to form an anion, which gives a total of 1 pair of valence electrons.

5. In BrF5, the bromine atom still has 7 valence electrons, and each fluorine atom has 7 valence electrons. The structure of BrF5 has one bromine atom surrounded by five fluorine atoms, resulting in a total of 5 pairs of valence electrons.

Answer 2

The number of valence electron pairs on bromine varies depending on its bonding and charge state, ranging from two to six pairs in different bromine-fluorine compounds.

Step-by-step explanation:

The number of pairs of valence electrons in bromine atoms within different molecules and ions can be determined by analyzing the electron structure of each compound. Bromine typically has seven valence electrons. Here's how many pairs of valence electrons there are in each scenario:

• BrF: This molecule has one bromine atom bonded to one fluorine atom. Bromine has three lone pairs and one bonding pair of electrons when bonded to fluorine.
• BrF2+: As a cation with two bonding pairs and no lone pairs, there are two pairs associated with bromine here because it has lost electrons due to the charge.
• BrF5: With five bonding pairs and one lone pair, there are in total six pairs of electrons around the bromine atom in this molecule.
• BrF2−: In this anion, the bromine atom gains an extra pair of electrons, resulting in three lone pairs and one bonding pair.
• BrF6: This is likely a typo, but if we assume the existence of BrF6+ (comparable to BrF5 but with extra fluorine), bromine would have six bonding pairs and no lone pairs.