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Elements are in the Periodic Table not substances, the most reactive of those elements would be Fluorine because of its electronegativity.

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12y ago
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8y ago

Fluorine.

And for more information - its chemical symbol is F, its atomic mass is 19. !!

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11y ago

Fluorine and Francium are the most reactive elements and are both poisonous.

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Q: What is the Most toxic substance know in periodic table?
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What are most of the elements on the periodic table-?

Most of the elements on the periodic table are metals.


Where are most massive elements found on the periodic table?

Bttom right of the Periodic Table


What elements on the periodic table are corrosive?

The most corrosive elements on the Periodic Table are all of the halogens.


What group is 1?

in the Periodic Table it is the most reactive metals!


What are the most table elements in the periodic table?

Most of them are metals.


Where are the most metallic atoms found on the periodic table?

On the left side of the periodic table.


What category do most of the periodic table fall over?

Metals are preponderant in the periodic table.


The most reactive nonmetals on the periodic table are?

The most reactive nonmetals are the halogens in group 17 of the periodic table.


Where on the periodic table is most reactive nonmetal?

The most reactive nonmetals are the halogens in group 17 of the periodic table.


What is the most toxic non metallic element in periodic table?

Recent events would suggest Polonium Po as the most lethal non-metllic element. see link.


What category of elements is the most common in the periodic table where is that category found in the periodic table?

The transition metals are the most common, and are found in the middle (groups 3-12) of the Periodic Table.


Where are the most nonmentals found in the periodic table?

Nonmetals are placed in the right side of the periodic table.