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16 Cards in this Set

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What is the periodic table?
The periodic table of the elements developed as an attempt to classify the elements. It arranges them in a pattern according to their properties
What was a major problem with some of the early periodic tables?
Early versions failed to take into account of the fact that not all of the elements were known at that time
Who was the key man who revolutionised the periodic table?
Dmitri Mendeleev. It took account of unknown elements and provided the basis for the modern periodic table.
How is an elements place in the periodic table determined?
By its atomic (proton) number
What determines the chemical properties of an atom?
The number of electrons in the highest energy level. E.G. If the arrangement is 2,8,8,2. It is in group 2 (last number). If its arrangement is 2,8,8,7 it is in group 7
How can we explain trend in reactivity as we go down a group?
Because of the number of energy levels in the atoms
What are the elements in group 1 of the periodic table called?
The alkali metals
When alkali metals react with water they produce ________ and _______
Hydrogen and an alkaline solution containing the metal hydroxide
The reactivity of the alkali metals increases/decreases as we go down the group
increases
What kind of molecules are the halogens?
diatomic (e.g. They always have a little two after their element. E.g. Cl2, Br2, I2)
When halogens form ions, what is their charge?
A single negative charge. Because they gain an electron. So the ion for Cl2 would be Cl- (sorry I can't do subscript and superscript)
What kind of compounds do the halogens form?
COVALENT compounds. They share electrons with other non-metals.
The reactivity of the halogens increases/decreases as you go down the group
decreases
What kind of melting points/density do the transition elements have?
High MP and high density.
What can you say about the conduction of heat an electricity in the transition metals?
They are very good conductors of them
Do the transition metals react vigorously with oxygen or water?
No. That's the alkali metals :)