Which is the most reactive metal on earth?
and how does reactivity gets affected in period and groups of periodic table?
The most reactive metal on earth is Francium, an Alkali metal. Its atomic number 87 and its symbol is Fr. Metals: Period - reactivity decreases as you go from left to right across a period. Group - reactivity increases as you go down a group. Reason is that the farther to the left and down the periodic chart you go, the easier it is for electrons to be given or taken away, resulting in higher reactivity. Non-metals: Period - reactivity increases as you go from the left to the right across a period Group- reactivity decreases as you go down the group. Reason is that, the farther right and up you go on the periodic table, the higher the electronegativity, resulting in a more vigorous exchange of electron.