Question

ᴅᴇꜰɪɴᴇ ʜᴇʟɪᴜᴍ.
ʜᴇʟʟᴏ.​

Answer 1

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 and melting point are the lowest among all the elements. Wikipedia

Symbol: He

Atomic mass: 4.002602 u

Atomic number: 2

Electron configuration: 1s2

Boiling point: -268.9 °C

Van der Waals radius: 140 pm

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