what is hiliyam .????????
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firstly it will be helium
helium:-
the chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series.
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Helium is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements.
Symbol: He
Atomic mass: 4.002602 u
Atomic number: 2
Electron configuration: 1s2
Boiling point: -268.9 °C
Discoverers: Pierre Janssen, Norman Lockyer, Per Teodor Cleve
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