What is the heaviest and most dense element on earth?

Answer 1

Osmium is densest followed by Irridium
Os
Osmium is the densest element known and the hardest of all platinum
group metals (PGMs). It is 10 times harder than platinum itself.
Osmium also has a higher melting point than the other PGMs.
P r o p e r t i e s
Electrical conductivity 0.109 106 cm-1 Ohm-1
Density 22.61 g/cc
Hardness (Brinell value) 3920 MN m-2
Melting point 3050 ºC
Rarity 1x10-4 ppm in lithosphere
Atomic number 76
Atomic weight 190.23
Electrical resistivity 8.12 microhm.cm at 0°C
Thermal conductivity 87 watts/metre/°C

Heaviest element I think is Francium
Francium is a chemical element in the periodic table that has the symbol Fr and atomic number 87. This is a highly radioactive alkali metal that is found in uranium and thorium ores.
This element, which was named for France, was discovered in 1939 by Marguerite Perey of the Curie Institute in Paris. Francium is the heaviest alkali metal and occurs as a result of actinium's alpha decay and can be artificially made by bombarding thorium with protons.

Even though it naturally occurs in uranium minerals, it has been estimated that there might be less than 30 grams of francium in the crust of the earth at any one time. It is the most unstable element among the first 101 and has the highest equivalent weight of any element.

There are 41 known isotopes of francium. With a 22 minute half life, the longest lived isotope of this element is 223Fr which is a daughter isotope of 227At and is the only isotope of francium that occurs naturally. All known isotopes of francium are highly unstable, therefore knowledge of the properties of this element only comes from radiochemical procedures.

A small number of pictures of francium have been taken but only of at the most 200,000 atoms at a time. The pictures were taken by trapping the atoms and using a special fluorescent imaging camera.

Answer 2

Heaviest Element

Answer 3

This Site Might Help You.

RE:
What is the heaviest and most dense element on earth?

Answer 4

Lutetium- densest and hardest rare earth metal


It is not certain whether osmium or iridium is the most dense element.


Uranium- is the heaviest and one of the most dense elements that occur in nature.

Answer 5

Osmium metal is the densest element being 22.5 g/mL.
Platinum is about 21 g/mL.
Gold is roughly 19 g/mL.

The heaviest element is questionable according to the writers in Wikipedia. It is between osmium & iridium.

Answer 6

Osmium and iridium are the most dense. Uranium is the heaviest.

Answer 7

Osmium is the most dense element which occurs naturally.

Answer 8

Mankind is the heaviest element because of sheer population & the innate dominant spirit inside all of us. And Mankind is the densest element because of the effect our race alone has on the entire earth. Politically we are disastrous, and we kill everything, even each other.

Answer 9

Ununoctium is the heaviest but it's not naturally occurring.

Answer 10

osmium and iridium are dense and uranium is heaviest