True is the correct because helio means sun in greek and the sun is in the center of our universe
2.4 x 10²² atoms
<h3>Further explanation</h3>
Atomic mass is the average atomic mass of all its isotopes
In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu
So the atomic mass obtained is the mass of the atom relative to the 12th carbon atom
mass single Uranium atom=4.7 x 10⁻²² g
then for 111 mg=0.111 g

D it’s quartz on the Mohs scale thing it’s ranked 7
The answer is Noble gas because they have a full octet
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