chemistry C2

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How did Mendeleev arrange the elements known at the time into a periodic table?
By using the mass number and other properties of the elements and the properties of their compounds.
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How did Mendeleev use his table?
To predict the existence and properties of some elements that were still to be discovered.
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where are the non-metals found in the periodic table?
at the top on the right hand side.
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Name 3 sub-atomic particles.
Protons, neutrons and electrons.
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Describe the structure of an atom.
A nucleus containing protons and neutrons, surrounded by electrons in shells.
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How does the size of the nucleus compare to the overall size of the atom.
The nucleus is very small. (if an atom were the diameter of the London eye, the nucleus would be the size of pea at the center!)
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what are the relative charges and masses of protons, neutrons and electrons.
Protons: mass 1, charge +1 Neutrons: mass 1, charge 0 Electrons: mass almost zero, charge -1.
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Which particle gives the atom identity?
The number of protons present.
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If an atom contains 12 protons, how many electrons will it have?
12
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What is the atomic number of an element?
The number of protons.
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What is the mass of an element?
The total number of protons and neutrons.
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What is the relative atomic mass, (Ar)?
The relative mass of an atom compared to the mass of an atom of carbon -12
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In what order are elements arranged in the periodic table?
In order of increasing atomic number.
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What do we call the rows and columns of the periodic table?
Rows are periods and groups are columns.
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Other cards in this set

Card 2

Front

How did Mendeleev use his table?

Back

To predict the existence and properties of some elements that were still to be discovered.

Card 3

Front

where are the non-metals found in the periodic table?

Back

Preview of the front of card 3

Card 4

Front

Name 3 sub-atomic particles.

Back

Preview of the front of card 4

Card 5

Front

Describe the structure of an atom.

Back

Preview of the front of card 5
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