The periodic table is a list of all of the atoms in the universe that have different numbers of electrons.


 

helium has two…

carbon has six

ooxygen … eight

 gold has 79

and uranium has 92

Today we know that it is the arrangement of electrons inside each atom that

determine its chemical properties. And similar arrangements lead to similar

properties.

There are two kinds

of quarks (physicists call them flavors of quarks) that are found in normal matter.

These quarks are the UP quark and the DOWN quark.

A proton is formed from two up quarks and one down quark while its slightly

heavier cousin, the neutron, is formed from two down quarks and one up quark.

 

210 Nucleus

These protons and neutrons can then combine to form the nucleus of each

element in the periodic table.

One proton in the nucleus makes hydrogen

2 form helium

6 … carbon

8 … oxygen

79 is gold and

92 … uranium

Neutrons help hold the protons together. Because of their electric charge,

protons would repel each other more strongly if neutrons were not present, and

the heavier elements would come apart.

There are approximately as many

neutrons in each element as there are protons.

 

220 ElectronShells

Atoms are formed when the positively charged protons in the nucleus capture

negative electrons. Neutral atoms have captured one negative electron for each

positive proton in the nucleus…so…

Hydrogen has one electron to go with its one proton

Helium … 2 electrons

Carbon has 6

Oxygen … 8

Gold has 79

And Uranium … 92

There are nearly 90 stable elements. The largest of them can contain close to

800 fundamental particles, joined in a complex but stable structure.

But electrons cannot just gather around in a crowd. The strange, wonderful

world of the tiny has some quantum idiosyncrasies. Electrons arrange

themselves in shells inside an atom like the layers of an onion…and only 2

electrons can fit per layer. So, the more electrons an atom has, the further away

from the nucleus the outer shells must be…and that means these electrons are

more loosely held.

It is this difference in how tightly electrons are held in each different kind of atom

that determines the chemical properties of that element. This accounts for the

ability of metals to conduct electricity, the aloofness of noble gases, and the

formation of molecules.

 

230 Molecules

It turns out that protons in two or more different nuclei can sometimes capture

(and fight over) the same electron. And when that happens, atoms of different

elements are joined together to form molecules.

This oxygen molecule is sharing two of its electrons with two hydrogen atoms –

this is how a water molecule is formed.

text above, courtesy of the Cassiopeia Project



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