Name: Helium
Symbol: He
Atomic Number: 2
Atomic Mass: 4.002602 amu
Melting Point: -272.0 °C (1.15 K, -457.6 °F)
Boiling Point: -268.6 °C (4.549994 K, -451.48 °F)
Number of Protons/Electrons: 2
Number of Neutrons: 2
Classification: Noble Gas
Crystal Structure: Hexagonal
Density @ 293 K: 0.1785 g/cm3
Color: colorless
The atomic number of Helium is 2.
2 is the atomic number (or the number of protons) of helium.
The noble gas with the smallest atomic number is helium, with an atomic number of 2.
Helium's atomic number is 2.
The outer shell of helium does not have an atomic number, that number belongs to helium itself whose atomic number is 2.
The atomic number of Helium is 2.
2 is the atomic number (or the number of protons) of helium.
The noble gas with the smallest atomic number is helium, with an atomic number of 2.
Helium's atomic number is 2.
The symbol of Helium is He. Helium's atomic number is 2.
The atomic number of helium is 2. It has 2 protons in its nucleus, which defines its atomic number.
The atomic number of the element Helium is two.
the number of helium in the periodic table is 2.
None. Helium is an element.
The outer shell of helium does not have an atomic number, that number belongs to helium itself whose atomic number is 2.
Helium is a metal element. Atomic number of it is 2.
4He or He4. 4 stands for the mass number of Helium Mass number = number of protons + number of neutrons Since the atomic number or number of protons in helium is 2, the number of neutrons in He-4 is also 2.