Definitions
There is 1 meaning of the phrase
Atomic Number 2.
Example Sentences
"Helium has an atomic number 2 and is a colorless gas."
"The atomic number 2 indicates that helium has 2 protons in its nucleus."
"When an atom has an atomic number 2, it means it has 2 electrons in its shells."
"Isotopes of atomic number 2 are used in magnetic resonance imaging (MRI) machines."
"The atomic number 2 element helium is a noble gas and does not readily combine with other elements."
