what is the most poisnious snake..

Brief：
Answers: The snake with the most potent toxin in the world, so far as we know, is the Inland Taipan, with what is called a sub-cutaneous LD-50 of .025.. 

Answers:

The snake with the most potent toxin in the world, so far as we know, is the Inland Taipan, with what is called a 'sub-cutaneous LD-50' of .025mg/kg. (The smaller the number, the more potent the toxin.)

The top 10 snakes tested so far are:

1. Oxyuranus microlepidotus (Inland taipan) 0.025

2. Pseudonaja textilis (Eastern brown snake) 0.0365

3. Aipysurus duboisii (Dubois's sea snake) 0.044

4. Pelamis platurus (Yellow bellied sea snake) 0.067

5. Acalyptophis peronii (Horned sea snake) 0.079

6. Oxyuranus scutellatus (Coastal taipan) 0.106

7. Bungarus multicinctus (Many banded krait) 0.108

8. Hydrophis melanosoma (Black banded sea snake) 0.111

9. Enhydrina schistosa (Beaked sea snake) 0.1125

10. Boulengeria christyi (Congo water cobra) 0.12

Not quite what we are always taught- the bit about the sea snake being more toxic is not quite right as far as actual research goes. but even this is a bit up for grabs! Venoms behave differently if they are adminstered under the skin, in the vein, or in the muscle.

Then there is the question of yield- how much venom is injected in an average bite, and how much does the snake produce and store total.

Next, you have the question of actual risk- how likely is this snake ot bite? How much does it come in contact with humans, etc.

Andacondas are not venomous at all, and the Black Mamba is an interesting choice- it is given a lot of press, but it only ranks #22 on the list with an LD-50 of 0.32- behind the US's own Tiger rattler at #17 with an LD-50 of 0.21!