Atomic Joke (no, really!)

Two atoms are walking down the street and they run into each other. One says to the other, "Are you all right?" 

"No, I lost an electron!" 

"Are you sure?" 

"Yeah, I'm positive!"

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What is an Atom?

Atoms make up all the matter around us including ourselves but what is an atom? The original definition of the word is ancient Greek and it was assigned to the theoretically smallest particle that could not be divided (atoma).
These days we know that atoms are made of yet smaller particles. There are three smaller particles that make up individual atoms. These are called subatomic particles as they are below the level of the atom in size.
The three particles are different in size and charge. Neutrons have no charge and are the largest subatomic particles. They are roughly the size of both a proton and an electron put together. Protons are slightly smaller than neutrons and have a positive (+) charge. Electrons are the smallest of all and carry a negative (-) charge.

The + and - charges are simply opposites of each other. They have been labeled + and - for convenience. Of course in reality these subatomic particles do not wear labels with their charge on them but it is easiest to the atom's structure if we keep the labels in place.It is also important to know that like charges repel and that opposite charges attract. This is best seen with two bar magnets. If you place the two North or South ends together they push apart whereas if you place a North and South end together they pull toward each other.
The protons and neutrons are clumped together in the middle of an atom and the electrons orbit around the outside. While this seems to contradict the idea that like charges repel, scientists have established that though protons (+) do indeed repel each other, once they are very close to each other another force, called the Strong Force, takes over and glues them together. The exact mechanism behind this force is not well understood.

What is an atom -- Electrons Orbiting
The electrons orbit the nucleus at great speed and distance. They are held in orbit by the pull of the oppositely charged protons in the nucleus and their speed prevents them from collapsing into the nucleus. This is similar to how satellites orbit the earth. As an example, for a Helium atom the structure is like this:

The electrons orbit the nucleus at such a great distance that 99.99% of the atom is empty space. The different numbers of protons and neutrons in the nucleus result in different elements and isotopes of those elements.




Cross posted @  http://homeschoolingnotebook.blogspot.com/2010/11/atomic-joke-no-really.html
SOURCES:
pun - Steve Schaffer (who else?)
http://www.green-planet-solar-energy.com/what-is-an-atom.html

Fun Math & Science Holidays

Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year. For example, the last Square Root Day was March 3, 2009 (3/3/09), and the next Square Root Day will be April 4, 2016 (4/4/16). The final Square Root Day of the century will occur on September 9, 2081. Square Root Days fall upon the same nine dates each century.

Pi Day and Pi Approximation Day are two unofficial holidays held to celebrate the mathematical constant π (pi). Pi Day is celebrated on March 14, or in the month/day date format as 3/14; since 3, 1 and 4 are the three most significant digits of π. March 14 is also the birthday of Albert Einstein so the two events are sometimes celebrated together. Pi Approximation Day is held on July 22, or in the more common day/month date format as 22/7, which is an approximate value of π.

Mole Day is an unofficial holiday celebrated among chemists on October 23, between 6:02 AM and 6:02 PM, making the date 6:02 10/23 in the American style of writing dates. The time and date are derived from Avogadro's number, which is approximately 6.02×10²³, defining the number of particles (atoms or molecules) in one mole of substance, one of the seven base SI units.
Mole Day originated in an article in The Science Teacher in the early 1980s. Inspired by this article, Maurice Oehler, now a retired high school chemistry teacher from Prairie du Chien, Wisconsin, founded the National Mole Day Foundation (NMDF) on May 15, 1991.
Many high schools around the United States, South Africa, Australia and in Canada celebrate Mole Day as a way to get their students interested in chemistry, with various activities often related to chemistry or moles.

• Some schools celebrate Mole Day on June 2 (6/02 in MM-DD format) and occasionally February 6 (06/02 in DD-MM format), rather than October 23 (10/23), presumably from 10:23 AM to 10:23 PM.
• Some schools celebrate "Mole Week" around October 23.
• The American Chemical Society sponsors National Chemistry Week, which occurs from the Sunday through Saturday during October in which the 23rd falls. This makes Mole Day an integral part of National Chemistry Week.

& btw)

the square route of -1 = i

Cross Posted @ http://homeschoolingnotebook.blogspot.com/2010/11/fun-math-science-holidays.html