Hydrogen (H)
Mass = 1.0 u Not metallic
Molecules:
With hydrogen: H2
With oxygen: H2O
Chemical Properties:
Burns in oxygen.
Does not react with water.
Sep 29­8:07 AM
Helium (He)
Mass = 4.0 u Not metallic
Molecules:
Does not form any molecules.
Chemical Properties:
Does not react with anything.
Sep 29­8:07 AM
1
Lithium (Li)
Mass = 6.9 u Metallic.
Density = 0.5 g/ml Hardness = 0.6
Molecules:
With hydrogen: LiH
With oxygen: Li2O
Chemical Properties:
Corrodes quickly in air.
Reacts violently with water to produce hydrogen
Sep 29­8:07 AM
Beryllium (Be)
Mass = 9.1 u Metallic.
Density = 1.8 g/ml Hardness = 5.5
Molecules:
With hydrogen: BeH2
With oxygen: BeO
Chemical Properties:
Reacts slowly in air.
Sep 29­8:07 AM
2
Boron (B)
Mass = 10.8 u Semi­metallic.
Density = 2.5 g/ml Hardness = 9.3
Molecules:
With hydrogen: BH3
With oxygen: B2O3
Chemical Properties:
Sep 29­8:07 AM
Carbon (C)
Mass = 12.0 u Not metallic.
Density = 2.3 g/ml
Molecules:
With hydrogen: CH4
With oxygen: CO2
Chemical Properties:
Reacts in air.
Sep 29­8:07 AM
3
Nitrogen (N)
Mass = 14.0 u Not metallic.
Molecules:
With hydrogen: NH3
With oxygen: many different
Chemical Properties:
Sep 29­8:07 AM
Oxygen (O)
Mass = 16.0 u Not metallic.
Molecules:
With hydrogen: OH2
With oxygen: O2
Chemical Properties:
Sep 29­8:07 AM
4
Fluorine (F)
Mass = 19.0 u Not metallic.
Molecules:
With hydrogen: FH
With oxygen: F2O
Chemical Properties:
Reacts with water to produce oxygen.
Reacts with metals and organic material ­ very corrosive.
Sep 29­8:07 AM
Neon (Ne)
Mass = 20.2 u Not metallic
Molecules:
Does not form any molecules.
Chemical Properties:
Does not react with anything.
Sep 29­8:07 AM
5
Sodium (Na)
Mass = 23.0 u Metallic.
Density = 0.9 g/ml Hardness = 0.5
Molecules:
With hydrogen: NaH
With oxygen: Na2O
Chemical Properties:
Corrodes quickly in air.
Reacts violently with water to produce hydrogen
Sep 29­8:07 AM
Magnesium (Mg)
Mass = 24.3 u Metallic.
Density = 1.7 g/ml Hardness = 2.5
Molecules:
With hydrogen: MgH2
With oxygen: MgO
Chemical Properties:
Reacts slowly in air.
Sep 29­8:07 AM
6
Aluminum (Al)
Mass = 27.0 u Metallic.
Density = 2.7 g/ml Hardness = 2.7
Molecules:
With hydrogen: AlH3
With oxygen: Al2O3
Chemical Properties:
Sep 29­8:07 AM
Silicon (Si)
Mass = 28.1 u Semi­metallic.
Density = 2.3 g/ml Hardness = 6.5
Molecules:
With hydrogen: SiH4
With oxygen: SiO2
Chemical Properties:
Reacts in air.
Sep 29­8:07 AM
7
Phosphorus (P)
Mass = 31.0 u Not metallic.
Density = 1.8 g/ml
Molecules:
With hydrogen: PH3
With oxygen: P4O6
Chemical Properties:
Burns in air.
Sep 29­8:07 AM
Sulfur (S)
Mass = 32.1 u Not metallic.
Density = 2.0 g/ml
Molecules:
With hydrogen: SH2
With oxygen: several different
Chemical Properties:
Burns in air.
Sep 29­8:07 AM
8
Chlorine (Cl)
Mass = 35.5 u Not metallic.
Molecules:
With hydrogen: ClH
With oxygen: Cl2O
Chemical Properties:
Reacts with water to produce bleach (HOCl).
Reacts with metals and organic material ­ very corrosive.
Sep 29­8:07 AM
Potassium (K)
Mass = 39.1 u Metallic.
Density = 0.9 g/ml Hardness = 0.4
Molecules:
With hydrogen: KH
With oxygen: K2O
Chemical Properties:
Corrodes quickly in air.
Reacts violently with water to produce hydrogen
Sep 29­8:07 AM
9
Argon (Ar)
Mass = 39.9 u Not metallic
Molecules:
Does not form any molecules.
Chemical Properties:
Does not react with anything.
Sep 29­8:07 AM
Calcium (Ca)
Mass = 40.1 u Metallic.
Density = 1.6 g/ml Hardness = 1.8
Molecules:
With hydrogen: CaH2
With oxygen: CaO
Chemical Properties:
Reacts slowly in air.
Reacts slowly in water.
Sep 29­8:07 AM
10
Gallium (Ga)
Mass = 69.7 u Metallic.
Density = 5.9 g/ml Hardness = 1.5
Molecules:
With hydrogen: GaH3
With oxygen: Ga2O3
Chemical Properties:
Sep 29­8:07 AM
Germanium (Ge)
Mass = 72.6 u Semi­metallic.
Density = 5.3 g/ml
Hardness = 6.0
Molecules:
With hydrogen: GeH4
With oxygen: GeO2
Chemical Properties:
Reacts in air.
Sep 29­8:07 AM
11
Arsenic (As)
Mass = 74.9 u Semi­metallic.
Density = 5.7 g/ml Hardness = 3.5
Molecules:
With hydrogen: AsH3
With oxygen: As2O3
Chemical Properties:
Burns in air.
Sep 29­8:07 AM
Selenium (Se)
Mass = 79.0 u Not metallic.
Density = 4.8 g/ml
Molecules:
With hydrogen: SeH2
With oxygen: several different
Chemical Properties:
Burns in air.
Sep 29­8:07 AM
12
Bromine (Br)
Mass = 79.9 u Not metallic.
Molecules:
With hydrogen: BrH
With oxygen: Br2O
Chemical Properties:
Reacts with water to produce HOBr.
Reacts with metals and organic material ­ very corrosive.
Sep 29­8:07 AM
Krypton (Kr)
Mass = 83.8 u Not metallic
Molecules:
Forms almost no molecules.
Chemical Properties:
Reacts with almost nothing.
Sep 29­8:07 AM
13
Rubidium (Rb)
Mass = 85.5 u
________________
Density = _____
Hardness = ______
Molecules:
With hydrogen: _____________________
With oxygen: Sep 29­8:07 AM
Strontium (Sr)
Mass = 87.6 u
________________
Density = _____
Hardness = ______
Molecules:
With hydrogen: _____________________
With oxygen: Sep 29­8:07 AM
14
Tellurium (Te)
Mass = 127.6 u
________________
Density = _____
Hardness = ______
Molecules:
With hydrogen: _____________________
With oxygen: Sep 29­8:07 AM
Iodine (I)
Mass = 126.9 u
________________
Density = _____
Hardness = ______
Molecules:
With hydrogen: _____________________
With oxygen: Sep 29­8:07 AM
15
Unknown 3 (X)
Mass = ? Metallic.
Density = 1.5 g/ml
Hardness = 0.3
Molecules:
With hydrogen: XH
With oxygen: X2O
Chemical Properties:
Corrodes quickly in air.
Sep 29­8:07 AM
Unknown 1 (A)
Mass = ? Metallic.
Density = 2.6 g/ml Hardness = 1.5
Molecules:
With hydrogen: AH2
With oxygen: AO
Chemical Properties:
Reacts in air.
Reacts slowly in water.
Sep 29­8:07 AM
16
Unknown 4 (Z)
Mass = ? Semi­metallic.
Density = 6.2 g/ml
Molecules:
With hydrogen: ZH2
With oxygen: several different
Chemical Properties:
Burns in air.
Sep 29­8:07 AM
Unknown 2 (D)
Mass = ? Not metallic
Molecules:
Forms almost no molecules.
Chemical Properties:
Reacts with almost nothing.
Sep 29­8:07 AM
17