Answer:
The lightest chemical element is Hydrogen and the heaviest is Hassium. The unity for atomic mass is gram per mol. ... There you can find the metals, semi-conductor(s), non-metal(s), inert noble gas(ses), Halogens, Lanthanoides, Actinoids (rare earth elements) and transition metals.
Explanation:
The difference of the atomic masses of the Uranium which is the heaviest and hydrogen which is the lightest element in the table is 237.
The lightest element in the periodic table is hydrogen having atomic mass of 1 amu whereas Uranium is the heaviest element present in the periodic table having atomic mass of 238 amu. The difference between atomic masses of the heaviest i.e. uranium and lightest element i.e. hydrogen in the table is 237. In hydrogen, there are only one proton and no neutron is present inside the nucleus while on the other hand, in uranium there is 92 protons and 146 neutrons are present in the nucleus which make it heaviest element.
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