lewis structures (3.9)

Question 1

what does the lewis structure show?

Answer 1

how valence electrons are arranged among the atoms in the molecule OR the valence electron arrangement of atoms in a molecule.

Question 2

what kinds of electrons are included in a lewis structure?

Answer 2

valence electrons ONLY.

Question 3

what is the lewis structure of KBr? explain why it’s like that.

Answer 3

[K]+
[Br+8 valence electrons around it]-

K is a metal with 1 valence electron and Br is a nonmetal with 7 electrons. in order bond, K has to lose its electron and give it to Br in order to become a molecule. they form an ionic bond and as a result, K becomes a cation (cuz it lost an electron) and Br becomes an anion (cuz it gained an electron)

Question 4

how many electrons does hydrogen to form a stable molecule?

Answer 4

2 electrons or a pair.

Question 5

which atoms always follow the octet rule in forming stable molecules?

Answer 5

carbon, nitrogen, oxygen, and fluorine.

Question 6

how many bonds does helium form? or how many electrons does helium need to form a stable molecule?

Answer 6

TRICK QUESTION! helium is a noble so it already has a full valence electron shell and therefore does not need to form any more bonds.