Periodic Table
Elements
Atoms
Chemistry History
Chemistry
100
What are the 3 main catagories that the periodic table are divided into?
Metals, Metalliods, Non-Metals
100
What element has a Valence of 2 and doesn't like to bond with other elements?
He
100
The smallest that any element can be broken down is called a/n...
Atom
100
Who originally came up with the idea of atoms?
Democritus
100
If one or more atoms combine this is called...
A molecule.
200
What are the states of matter that the elements are grouped into?
Solids, Liquids, Gases, Synthetic or Man-Made
200
What is the only liquid metal at room temp.
Mercury (Hg)
200
The largest section of an atom is called.
The Nucleus
200
Who discovered the nucleus of the atom?
Ernest Rutherford
200
What is the difference between a compound and a molecule? Explain
A molecule is 2 or more atoms that can be the same or different, while a Compound has to have at least 1 of the atoms being different.
300
How many elements are on the periodic table? (or how many could there be)
118
300
How many protons are in Oxygen and Carbon? (total)
14
300
In atoms what are the two most important charges?
Positive and Negative
300
Who discovered the electron?
J.J. Thomson
300
If you were to take Boron and want to make it have a full valence how many would you have to add or substract from it?
You would have to add 5.
400
What are the Vertical and Horizontal groupings that the elements are listed in?
Columns & Rows, or Groups & Periods
400
What is the list of Elements that have a full valence level of 8 (except one which has a valence of 2) and do not like to combine with other elements?
Noble Gases
400
How many atoms could fit on the end of a pinhead?
7.5 Trillion
400
What theory did Artistole favor and what were they?
4 Elements - Fire, Water, Earth, Air
400
Why do columns 3-12 not work with the valence rule?
Because they metallically bond and it means that they are constantly gaining or losing electrons and don't hold a stable valence.
500
Explain how the columns explain valence.
1,2,13-18 all tell how many electrons are on the outer most energy level.
500
What are the first ten elements in order?
H, He, Li, Be, B, C, N, O, F, Ne
500
What is it called when an atom has an overall positive or negative charge?
Ion
500
What is used to "see" atoms?
Scanning Tunneling Microscope
500
What is the difference between Ionic and Colavent Bonding?
Ionic the atoms bond because they are positive and negative while in Colavent bonding they are bonded to make a full valence of 8 (or 2)
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