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H (o-o)
Hydride H^-

Li
⁺

Be
²⁺
Beryl

B
^{3+, 3-}
Borax

N (o-o)
Nitride
^3-

O (o-o)
Oxide
^2-

F (o-o)
Fluoride
^1-

Na
⁺

Mg
²⁺
Dolomite

Al
³⁺
Bauxite

Si
⁴⁺
Quartz

P
Phosphide
^3-

S
Sulfide
^2-

Cl (o-o)
Chloride
^1-

Ca
²⁺
Limestone

Sc
⁺⁺⁺

Ti
⁴⁺

V
^{3+, 4+, 5+}

Cr
^{2+, 3+}

Mn
^{2+, 3+}

Fe
^{2+, 3+}
Bog ore

Co
^{2+, 3+}

Ni
^2+,3+

Cu
^{+, 2+}
Malachite

Zn
⁺⁺

Ga
³⁺

As
^{3-, 3+, 5+}

Se
Selenide
^2-

Br (o-o)
Bromide
^1-

Rb
⁺

Sr
²⁺

Y
⁺⁺⁺

Ag
⁺

Cd
⁺⁺

In
³⁺

Sn
^{2+, 4+}
Cassiterite

Te
^{2-, 2+, 4+, 6+}

I (o-o)
Iodide
^1-

Cs
⁺

Ba
²⁺

Au
^{+, 3+}

Hg
²⁺

Pb
^{2+, 4+}
Cerussite

Bi
³⁺

Francium (Fr)

Francium videos

Alkali metal Francium is a radioactive and extremely rare element that was discovered in 1939. The total amount
of Fr in the entire Earth's crust is estimated at just 20-30 g. All alkali metals occur in nature exclusively
in the form of positively charged ions as constituents of a broad variety of minerals and salts.