Helium atom in 3D
Cooling and light gases. Helium provides low-temperature cooling for scientific equipment. Its low density is useful in balloons. Explore the 3D model, inspect its parts and learn with guided explanations. Free on Atlas.
What you can learn
Cooling and light gases. Helium provides low-temperature cooling for scientific equipment. Its low density is useful in balloons.
Identify helium from its proton count.
Count the neutrons in Helium-4.
Inspect the occupied electron shells.
Compare the valence shell with a neighbouring element.
Explain what changes when an electron is lost.
Helium’s first shell is complete with two electrons. It does not need eight electrons to complete that shell.
Try an investigation
Identify helium from its proton count.
Check your understanding
What identifies an atom as helium?
2 protons. Atomic number is proton count. Every helium nucleus has 2 protons.
How many neutrons are in Helium-4?
2. Neutrons = mass number − atomic number = 4 − 2 = 2. Mass number is not the average atomic weight of natural samples.
How many electrons are in a neutral helium atom?
2. A neutral atom balances 2 positive protons with 2 negative electrons.
Which shell count describes neutral helium in its ground state?
2. 1s² gives 2 electrons across its occupied shells. Circular paths are only diagram guides.
If this atom loses one electron, what happens to its net charge?
It becomes +1. Losing one negative electron leaves one more proton than electrons. Its 2 protons still identify it as helium.
What can this 3D shell model tell you reliably?
The particle counts for the selected neutral isotope. The counts represent a defined isotope and neutral atom. Particle sizes, spacing and circles are simplified teaching symbols.
Sources and model scope
An educational representation. The explorer identifies its data sources, scale choices and simplifications.