Atomic Number: 1
Element Symbol: H
Period: 1
Metal / Metalloid / Nonmetal: Nonmetal
Group: Group 1 gas of diatomic molecules)
Year Discovered: 1766 (Henry Cavendish)
Electrons: $$1s^1$$

Atomic Number: 2
Element Symbol: He
Period: 1
Metal / Metalloid / Nonmetal: Nonmetal
Group: Group 18 (noble gas)
Year Discovered: 1868 (Pierre Jules Jansen)
Electrons: $$1s^2$$

Atomic Number: 3
Element Symbol: Li
Period: 2
Metal / Metalloid / Nonmetal: Alkali Metal
Group: Group 1
Year Discovered: 1817 (Johan August Arfwedson)
Electrons: $$[He]2s^1\;$$or$$\;1s^22s^1$$

Atomic Number: 4
Element Symbol: Be
Period: 2
Metal / Metalloid / Nonmetal: Alkaline Earth Metal
Group: Group 2 (alkaline earth)
Year Discovered: 1798 (Louis Nicholas Vauquelin)
Electrons: $$[He]2s^2$$or$$1s^22s^2$$

Atomic Number: 5
Element Symbol: B
Period: 2
Metal / Metalloid / Nonmetal: Metalloid
Group: Group 13
Year Discovered: 1808 (Three different scientists)
Electrons: $$[He] 2s^22p^1$$or$$1s^22s^22p^1$$

Atomic Number: 6
Element Symbol: C
Period: 2
Metal / Metalloid / Nonmetal: Nonmetal
Group: Group 14 (Carbon Group)
Year Discovered: Ancient times
Electrons: $$[He] 2s^22p^2$$or$$1s^22s^22p^2$$

Atomic Number: 7
Element Symbol: N
Period: 2
Metal / Metalloid / Nonmetal: Nonmetal
Group: Group 15 (pnictogen)
Year Discovered: 1772 (Daniel Rutherford)
Electrons: $$[He] 2s^22p^3$$or$$1s^22s^22p^3$$

Atomic Number: 8
Element Symbol: O
Period: 2
Metal / Metalloid / Nonmetal: Nonmetal
Group: Group 16 (chalcogen)
Year Discovered: 1773 (Carl Wilhelm Scheele)
Electrons: $$[He] 2s^22p^4$$or$$1s^22s^22p^4$$

Atomic Number: 9
Element Symbol: F
Period: 2
Metal / Metalloid / Nonmetal: Nonmetal
Group: Group 17
Year Discovered: 1886 (Henri Moissan)
Electrons: $$[He] 2s^22p^5$$or$$1s^22s^22p^5$$

Atomic Number: 10
Element Symbol: Ne
Period: 2
Metal / Metalloid / Nonmetal: Nonmetal
Group: Group 18 (noble gas)
Year Discovered: 1898 (Ramsay and Travers)
Electrons: $$[He]2s^22p^6$$or$$1s^22s^22p^6$$

Atomic Number: 11
Element Symbol: Na
Period: 3
Metal / Metalloid / Nonmetal: Alkali Metal
Group: Group 1
Year Discovered: 1807 (Sir Humphry Davy)
Electrons: $$[Ne]3s^1$$or$$1s^22s^22p^63s^1$$

Atomic Number: 12
Element Symbol: Mg
Period: 3
Metal / Metalloid / Nonmetal: Alkaline Earth Metal
Group: Group 2 (alkaline earth)
Year Discovered: 1755 (Joseph Black)
Electrons: $$[Ne]3s^2$$or$$1s^22s^22p^63s^2$$

Atomic Number: 13
Element Symbol: Al
Period: 3
Metal / Metalloid / Nonmetal: Metal
Group: 13 (Boron hroup)
Year Discovered: 1807 (Hans Christian Ørsted)
Electrons: $$[Ne]3s^23p^1$$or$$1s^22s^22p^63s^23p^1$$

Atomic Number: 14
Element Symbol: Si
Period: 3
Metal / Metalloid / Nonmetal: Metalloid
Group: 14
Year Discovered: 1824 (Jöns Jacob Berzelius)
Electrons: $$[Ne]3s^23p^2$$or$$1s^22s^22p^63s^23p^2$$

Atomic Number: 15
Element Symbol: P
Period: 3
Metal / Metalloid / Nonmetal: Nonmetal
Group: 15
Year Discovered: 1669 (Hennig Brand)
Electrons: $$[Ne]3s^23p^3$$or$$1s^22s^22p^63s^23p^3$$

Atomic Number: 16
Element Symbol: S
Period: 3
Metal / Metalloid / Nonmetal: Nonmetal
Group: 16
Year Discovered: Ancient times
Electrons: $$[Ne]3s^23p^4$$or$$1s^22s^22p^63s^23p^4$$

Atomic Number: 17
Element Symbol: Cl
Period: 3
Metal / Metalloid / Nonmetal: Nonmetal
Group: 17
Year Discovered: 1774 (Carl Wilhelm Scheele)
Electrons: $$[Ne]3s^23p^5$$or$$1s^22s^22p^63s^23p^5$$

Atomic Number: 18
Element Symbol: Ar
Period: 3
Metal / Metalloid / Nonmetal: Nonmetal
Group: 18
Year Discovered: 1894 (Lord Rayleigh and Sir William Ramsay)
Electrons: $$[Ne]3s^23p^6$$or$$1s^22s^22p^63s^23p^6$$

Atomic Number: 19
Element Symbol: K
Period: 4
Metal / Metalloid / Nonmetal: Alkali Metal
Group: 1
Year Discovered: 1807 (Sir Humphry Davy)
Electrons: $$[Ar]4s^1$$or$$1s^22s^22p^63s^23p^64s^1$$

Atomic Number: 20
Element Symbol: Ca
Period: 4
Metal / Metalloid / Nonmetal: Alkaline Earth Metal
Group: 2
Year Discovered: 1808 (Sir Humphry Davy)
Electrons: $$[Ar]4s^2$$or$$1s^22s^22p^63s^23p^64s^2$$