Which atomic particle has the most mass?

Answer 1

Uranium - atomic weight; 238,02891

But now it is more correct to consider plutonium as the heaviest natural element (mass: 244 for the isotope 244Pu).

Answer 2

Chlorine

Answer 3

There are a couple of ways to answer this.

1. The element with the most collective mass in the universe is: Hydrogen (75%)
2. The element with the most collective mass on earth is Oxygen (about 46%)
3. The most massive atom that is stable is lead. (All others will eventually decay into something smaller) We used to think it was Bismuth, but have since learned that Bi also decays.
4. The most massive naturally occurring element that we know of is Uranium with an AMU of 238. There might be some wiggle room here. Some think there might be one of two that are bigger. But anything above Uranium was artificially made or lasts only a very brief period of time.
5. The largest atoms ever made (does not exist in nature) are Ununseptium and Ununoctium both with an AMU of 294

Answer 4

There are two elements that can be considered to be the heaviest. These elements are osmium or iridium. They are also the most dense.

Answer 5

Element hassium has the largest Atomic Mass.

Answer 6

The particle that has the most mass is the neutron, although the proton is almost similar in weight. The neutron, together with the proton, make up most of the weight of the atom.

Answer 7

ununnilium