1. Consulting a periodic table: Which of the six cations studied are found in Group 1 (the alkali metals)? Which are found in Group 2 (the alkaline metals)? 2. Refer to your observations of how the Group 1 and Group 2 metal ions behaved in terms of forming precipitates and circle the correct responses. The Group 1 metal ions did did not tend to form precipitates easily. The Group 2 metal ions did did not tend to form precipitates easily The elements in Group 17 (listed as Group VII A on some periodic tables) are the halogens. 3. The anions in solution for today\'s experiment were derived from these elements and are called halides The halogens exist as diatomic species (Cl, Br2, 12) when they are not part of a compound or if they are not charged There really is a huge difference between a halogen and a halide. The halogens tend to be fairly reactive and do serious damage to living tissue while the halides are generally harmless: Cl2 (chlorine) is a halogen used to kill bacteria in swimming pools. Pure chlorine is a toxic yel low gas that can cause serious lung damage and death if inhaled. Cl (chloride ion) is a halide found in table salt. You shake it on your food and consume it every day. Which species do you suppose is commonly found in toothpaste, Which is fluoride? orF Which is fluorine? 4. The negative ions studied in today\'s experiment were all monatomic. When aluminum chloride, AICI3, dissolves in solution it produces an aluminum ion, A13+, and three individual chloride ions, Cl Alcl dissolved in water ? Ap- CI- CI- CI- There are also many polyatomic ions. These are species made up of two or more atoms bonded together: Carbonate ion Co2 Nitrate ion NO, Nitrate ion NCO Solution 1) Alkali metal cation :- Li + (Lithium) , Na + (sodium),K + (potassium),Rb + (Rubidium),Cs + (Caesium), Fr + (Francium) Alkaline earth metals :- Be 2+ (Beryllium) ,Mg 2+ (Magnesium) , Ca 2+ (Calcium) , Sr 2+ (Strontium) , Ba 2+ (Barium) , Ra 2+ (Radium ) 2) The group 1 metals did not tend to form precipitates easily The group 2 metals did tend to form precipitates easily. 3) F - is present in toothpaste . Commonly SnF 2 is present in toothpaste. Fluoride is F - ; Fluorine is F 2 .

1. 1. Consulting a periodic table: Which of the six cations studied are found in Group 1 (the alkali
metals)? Which are found in Group 2 (the alkaline metals)? 2. Refer to your observations of how
the Group 1 and Group 2 metal ions behaved in terms of forming precipitates and circle the
correct responses. The Group 1 metal ions did did not tend to form precipitates easily. The Group
2 metal ions did did not tend to form precipitates easily The elements in Group 17 (listed as
Group VII A on some periodic tables) are the halogens. 3. The anions in solution for today's
experiment were derived from these elements and are called halides The halogens exist as
diatomic species (Cl, Br2, 12) when they are not part of a compound or if they are not charged
There really is a huge difference between a halogen and a halide. The halogens tend to be fairly
reactive and do serious damage to living tissue while the halides are generally harmless: Cl2
(chlorine) is a halogen used to kill bacteria in swimming pools. Pure chlorine is a toxic yel low
gas that can cause serious lung damage and death if inhaled. Cl (chloride ion) is a halide found in
table salt. You shake it on your food and consume it every day. Which species do you suppose is
commonly found in toothpaste, Which is fluoride? orF Which is fluorine? 4. The negative ions
studied in today's experiment were all monatomic. When aluminum chloride, AICI3, dissolves
in solution it produces an aluminum ion, A13+, and three individual chloride ions, Cl Alcl
dissolved in water ? Ap- CI- CI- CI- There are also many polyatomic ions. These are species
made up of two or more atoms bonded together: Carbonate ion Co2 Nitrate ion NO, Nitrate ion
NCO
Solution
1) Alkali metal cation :- Li +
(Lithium) , Na +
(sodium),K +
(potassium),Rb +
(Rubidium),Cs +
(Caesium), Fr +
(Francium)
Alkaline earth metals :- Be 2+
(Beryllium) ,Mg 2+
(Magnesium) , Ca 2+
(Calcium) , Sr 2+
(Strontium) , Ba 2+
(Barium) , Ra 2+
(Radium )
2) The group 1 metals did not tend to form precipitates easily
The group 2 metals did tend to form precipitates easily.
3) F -
is present in toothpaste . Commonly SnF 2 is present in toothpaste.
Fluoride is F -
; Fluorine is F 2