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An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers (a ten-billionth of a meter, in the short scale). Atoms are small enough that attempting to predict their behavior using classical physics – as if they were billiard balls, for example – gives noticeably incorrect predictions due to quantum effects. Through the development of physics, atomic models have incorporated quantum principles to better explain and predict this behavior. Every atom is composed of a nucleus and one or more electrons bound to the nucleus. The nucleus is made of one or more protons and typi… more »

Year:

2005

2:27

233 Views

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#4

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Forget your troubles (Happy days)
Come on get happy (are here again)
You better chase all your cares away 
(The skies above are clear again)
Shout hallelujah (So let's sing a song)
Come on get happy (of cheer again)
Get ready for the judgment day (Happy days are here again)

The sun is shining
Come on get happy (Shout it now)
The Lord is waiting to take your hand 
(There's no one who can doubt it now)
Shout hallelujah (So let's tell the world)
And just get happy (about it now)
We're going to the promise land 
(Happy days are here again)

We're heading across the river
Soon your cares will all be gone
There'll be no more from now on
From now on

Forget your troubles (Happy days)
And just get happy (are here again)
You better chase all your blues away 
(The skies above are clear again)
Shout hallelujah (So let's sing a song)
And just get happy (of cheer again)

Happy times (Happy times)
Happy nights (Happy nights)
Happy days
Are here again

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