The best answer is a - uranium.
You are watching: Radon is the heaviest naturally radioactive
The heaviest naturally occurring element is Uranium. It has actually a thickness of 18.95g/cubic cm. That most common isotope is uranium 238, which has nucleus that has actually 92 protons and also 146 neutrons.
On earth, it is 40 times more abundant 보다 silver and almost as typical as tin. Its half life is 4.47 billion years.
Uranium was uncovered by a human being known as Martin Klaproth that Germany in the year 1789. He called it after ~ the earth Uranus.
Noble gases are group 18 facets which have totally filled valence shell. Hence they perform not shed or gain electrons and also are dubbed as nonreactive or noble.
Electron construction of radon is:
Halogens are group 17 elements and also have a valency the 1 together they can acquire one electron to attain stable configuration.
Group 1 aspects are alkali steels which have actually a valency of 1 together they can lose your outermost electron to attain stable configuration.
Diatomic method the molecule consists of two atom in one molecule.
(A) noble gases / team 18
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