Helium

Number of

• Protons: 2
• Electrons: 2
• Neutrons: 1 or 2

common isotopes

• Helium-3: 0.000134% abundance
• Helium-4: 99.999866% abundance
• 8 valance electrons

Helium

• Electron configuration: 1s2
• Non-metal
• Natural state: Gas

Atomic Radius: 31

• The size of the atom
• Helium has only 1 shell so it is small.
• There are 2 protons that will suck in the shell making it smaller than hydrogen.

Ionization Energy: 245,974

• Helium has a high ionization energy because its outermost sub level is full and it's stable. It wouldn't want to lose an electron so the amount of energy required will be high.

Untitled Slide

Electronegativity: no data

• It's not going to attract electrons because its sub levels are full.
• Its a noble gas and is unreactive.

Why helium is where it is on the periodic table:
Helium is a noble gas. Noble gases are unreactive because their outermost s and p sublevels are completely filled. Helium fills it's s sublevel.

common uses

• To fill balloons
• Cooling medium for nuclear reactors
• Protective gas for semiconductor materials
• Gas for super sonic wind tunnels

Websites

• http://www.webelements.com/helium/uses.html
• http://en.wikipedia.org/wiki/Helium
• http://www.lenntech.com/periodic-chart-elements/ionization-energy.htm
• https://dept.astro.lsa.umich.edu/~cowley/ionen.htm
• http://physics.nist.gov/PhysRefData/Handbook/Tables/heliumtable1.htm

Hot air balloons don't actually have helium.