Lithium Atomic number: 3 Atomic weight: 7 State of matter: solid Protons: 3 Neutrons (usually): 4 Electrons: 3 Number of electron shells:

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1 Hydrogen Atomic number: 1 Atomic weight: 1 Protons: 1 Neutrons (usually): 0 Electrons: 1 H Helium Atomic number: 2 Atomic weight: 4 Protons: 2 Neutrons (usually): 2 Electrons: 2 He Lithium Atomic number: 3 Atomic weight: 7 Protons: 3 Neutrons (usually): 4 Electrons: 3 Li Beryllium Atomic number: 4 Atomic weight: 9 Protons: 4 Neutrons (usually): 5 Electrons: 4 Be

2 Boron Atomic number: 5 Atomic weight: 11 Protons: 5 Neutrons (usually): 6 Electrons: 5 B Carbon Atomic number: 6 Atomic weight: 12 Protons: 6 Neutrons (usually): 6 Electrons: 6 C Nitrogen Atomic number: 7 Atomic weight: 14 Protons: 7 Neutrons (usually): 7 Electrons: 7 N Oxygen Atomic number: 8 Atomic weight: 16 Protons: 8 Neutrons (usually): 8 Electrons: 8 O

3 Fluorine Atomic number: 9 Atomic weight: 19 Protons: 9 Neutrons (usually): 10 Electrons: 9 F Neon Atomic number: 10 Atomic weight: 20 Protons: 10 Neutrons (usually): 10 Electrons: 10 Ne Sodium Atomic number: 11 Atomic weight: 23 Protons: 11 Neutrons (usually): 12 Electrons: 11 Na Magnesium Atomic number: 12 Atomic weight: 24 Protons: 12 Neutrons (usually): 12 Electrons: 12 Mg

4 Aluminum Atomic number: 13 Atomic weight: 27 Protons: 13 Neutrons (usually): 14 Electrons: 13 Al Silicon Atomic number: 14 Atomic weight: 28 Protons: 14 Neutrons (usually): 14 Electrons: 14 Si Phosphorus Atomic number: 15 Atomic weight: 31 Protons: 15 Neutrons (usually): 16 Electrons: 15 P Sulfur Atomic number: 16 Atomic weight: 32 Protons: 16 Neutrons (usually): 16 Electrons: 16 S

5 Chlorine Atomic number: 17 Atomic weight: 35 Protons: 17 Neutrons (usually): 18 Electrons: 17 Cl Argon Atomic number: 18 Atomic weight: 40 Protons: 18 Neutrons (usually): 22 Electrons: 18 Ar Potassium Atomic number: 19 Atomic weight: 39 Protons: 19 Neutrons (usually): 20 Electrons: 19 K Calcium Atomic number: 20 Atomic weight: 40 Protons: 20 Neutrons (usually): 20 Electrons: 20 Ca

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