Question

1. complete the following

how many valence electrons does bromine have? (first blank)
how many bonding electrons does bromine have? (second blank)
how many valence electrons does phosphorus have? (third blank)
how many lone pairs does phosphorus have? (fourth blank)
(record your four - digit answer in the numerical - response section below.)
your answer: □□□□

Explanation:

Step1: Determine bromine's valence electrons

Bromine is in group 17 of the periodic table, so it has 7 valence electrons.

Step2: Determine bromine's bonding electrons

In a bromine - bromine single - bond ($Br_2$), each bromine atom contributes 1 electron to the bond, so the number of bonding electrons for a single bromine atom in $Br_2$ is 1.

Step3: Determine phosphorus's valence electrons

Phosphorus is in group 15 of the periodic table, so it has 5 valence electrons.

Step4: Determine phosphorus's lone pairs

Phosphorus has 5 valence electrons. In a molecule like $PCl_3$, it forms 3 bonds, using 3 of its valence electrons. So the number of non - bonding (lone pair) electrons is $5 - 3=2$, which is 1 lone pair.

Answer:

7151