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What is the helium.... |
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Answer» Answer: Explanation: 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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