Question

shade metals blue and the non - metals red.

1. how many valence electrons do metals have? (circle the answer)

a. metals have 1 or 2 valence electrons.
b. metals have less than 4 valence electrons.
c. metals have 4 valence electrons.
d. metals have 4 or more than 4 valence electrons.

1. how many valence electrons do non - metals have? (circle the answer)

a. non - metals have 1 or 2 valence electrons.
b. non - metals have less than 4 valence electrons.
c. non - metals have 4 valence electrons.
d. non - metals have 4 or more than 4 valence electrons.

1. helium, neon and argon are all “noble gases”. what is special about their valence shell?
2. how many valence electrons would you expect the following elements to have? (hint: look at the group they are in)

potassium strontium gallium
bromine krypton iodine

Explanation:

• For question 5, metals typically have less than 4 valence - electrons which allows them to lose electrons easily and form positive ions.
• For question 6, non - metals usually have 4 or more valence electrons and tend to gain electrons to form negative ions.
• For question 7, noble gases have a full valence shell. Helium has 2 valence electrons and neon and argon have 8 valence electrons, which makes them very stable and unreactive.
• For question 8, elements in the same group of the periodic table have the same number of valence electrons. Potassium is in Group 1, so it has 1 valence electron. Strontium is in Group 2, so it has 2 valence electrons. Gallium is in Group 13, so it has 3 valence electrons. Bromine is in Group 17, so it has 7 valence electrons. Krypton is in Group 18, so it has 8 valence electrons. Iodine is in Group 17, so it has 7 valence electrons.

Answer:

1. b. Metals have less than 4 valence electrons.
2. d. Non - metals have 4 or more than 4 valence electrons.
3. Their valence shell is full (helium has 2 valence electrons, neon and argon have 8 valence electrons).
4. Potassium: 1, Strontium: 2, Gallium: 3, Bromine: 7, Krypton: 8, Iodine: 7