Search

Home > 4. Chemistry and Physics > Atomic Number
Podcast: 4. Chemistry and Physics
Episode:

Atomic Number
Category: Science & Medicine
Duration: 00:00:59
Publish Date: 2011-07-13 19:29:25
Description: Transcript: Each element is defined by a unique atomic number which is the number of protons and electrons in an atom of that element. The atomic weight is the sum of the number of protons and neutrons. Over ninety percent of the universe is made of the two simplest elements: hydrogen with one proton and an orbiting electron, and helium with two protons, two neutrons, and two orbiting electrons. The next elements are very rare in the universe: lithium and beryllium, atomic numbers of three and four. Boron is also rare, atomic number of 5. The next three elements carbon, nitrogen and oxygen, the basis of life itself, are atomic numbers 6, 7, and 8, and atomic weights 12, 14, and 16. These comprise the simplest elements in the universe and the first elements in the periodic table.
Total Play: 0