Explanation:
Helium is the second element on the periodic table.
Information about helium:
- it belongs to group O on the periodic table
- it is has an atomic number of 2
- Helium exists naturally as gas and it is nonreactive.
To write an atom we use this format:
ₙᵇGˣ
G is the symbol of the atom
n is the atomic number
b is the mass number
x is the charge on the atom
Using the periodic table as guide
Symbol of helium is He
Atomic number of helium is 2
mass number of helium is 4
charge on helium atom is 0
⁴₂He
Every atom contains protons, neutrons and electrons;
Electrons are negatively charged. For a neutral atom, the number of electrons is the same as that of protons.
Protons are positively charge particles in an atom. The atomic number is the number of protons in an atom.
neutrons do not have charges.
Helium has:
Number of protons = 2
Number of electrons = 2
Number of neutrons = 2
Mass of each subatomic particle:
1 electron = 9.11 x 10⁻³¹kg
2 electrons = 1.82 x 10⁻³⁰kg
Protons and neutrons have the same mass:
1 proton = 1.67 x 10⁻²⁷kg
2 protons = 3.34 x 10⁻²⁷kg
2 neutrons = 3.34 x 10⁻²⁷kg
Learn more:
helium brainly.com/question/2439349
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