Chemical Families (Pre-IB SC 9)
I am highly reactive, I react with both oxygen and water, and I am soft and can be cut with a knife. Which chemical family am I?
Alkali Metals
What group are the alkali metals in?
Group 1, excluding hydrogen
I can produce bright flames and am used in fireworks, I react with water, and I am soft and can be cut with a knife. Which chemical family am I?
Alkaline Earth Metals
Which group are the alkaline earth metals in?
Group 2
I am a non-metal and I am highly reactive. Which chemical family am I?
Halogens
Which group are the halogens in?
Group 17
I am the most stable, I am unreactive, at room temperature I am colorless, odorless, and gasless, and I sometimes glow because electricity "excites" me. Which chemical family am I?
Noble gases
Which group are the noble gases in?
Group 18
What is the ionic charge of the alkali metals?
1+
What is the ionic charge of the alkaline earth metals?
2+
What is the ionic charge of halogens?
1-
What is the ionic charge of noble gases?
0
How many valence electrons do alkali metals have?
1
How many valence electrons do alkaline earth metals have?
2
How many valence electrons do halogens have?
7
How many valence electrons do noble gases have?
8, except for helium which has 2
Why is helium placed with the noble gases?
The noble gases are characterized by their full valence shells, and helium's valence shell is full. It has 2 valence electrons while the rest of the noble gases have 8, but it is still stable and unreactive.
Why is hydrogen placed with alkali metals?
Hydrogen is placed with the alkali metals even though it is a non-metal, and it is because hydrogen has one valence electron like the other elements in group 1. It also shares certain properties of the group 1 elements. (ex. good reducing agent)