Top 10 Most Dangerous Elements on the Periodic Table

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The Top Ten

1 Caesium

It looks like gold but don't be fooled for it is explosive in water and cannot be used as a jewelry! - JuliaRandomly

Pyrophoric and vigorously reacts w/ water.

2 Plutonium Plutonium

Used to make nuclear bombs. Ingestion of small amount can be lethal.

3 Polonium

It's found in tobacco! Another reason to stop smoking! (It's highly radioactive, with it's most stable isotope being about 139 days. For comparison, uranium's most stable isotope being around 4.5 billion years! )

Not really. Polonium 210 is far from the most stable. The actual most stable isotope has a half-life of 2000 years. - bstrz04

4 Uranium

BECAUSE I LOVE THE JUICE

5 Technetium
6 Mercury
7 Fluorine

Reactive, electronegative and an oxidizer, Fluorine must deserves the first place!

8 Tennessine
9 Oganesson

Just is dangerous. Don't mess with it

10 Arsenic

Preety dangerous, toxic and has many allotropes although my favorite among the metalloids. - JuliaRandomly

If you try to combine even a few micro grams of this element it will explode, since you can only combine so little, scientist can't even be positive on what it looks like
That is why this is the most dangerous element

The Contenders

11 Thallium

Sure kills lots of people. Dangerous is it's word.

12 Francium
13 Radium
14 Radon

I think it's RAD

This is a radioactive noble gas, thus unable to create any compunds or be in a stable state.
Also this is the 2nd most common cause of lung cancer after smoking.
Might not be as dangerous as plutonium but definitely one of the most dangerous elements.

15 Chlorine
16 Beryllium
17 Chromium
18 Thorium
19 Astatine
20 Cadmium
21 Lead

Toxic that was once abundant in uses - JuliaRandomly

22 Carbon
23 Osmium
24 Hydrogen
25 Protactinium

Super deadly. One bare touch and your dead.

26 Actinium
27 Berkelium
28 Einsteinium
29 Californium
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