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13 Cards in this Set
- Front
- Back
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What does the period number match? |
The number of shells in the atom |
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What does the group number match? |
The number of electrons in the outer shell |
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What did James Chadwick discover? |
That atoms have neutrons. They are found in the centre of the atom. |
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What did Niel Bohrs theory suggest? |
That electrons revolve around the nucleus in specific orbits and do not lose energy. The orbit closest to the nucleus has minimum energy. |
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What did the alpha particle experiment suggest? |
Most of an atom is empty space but they have a very small heavy nucleus. |
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What was the plum pudding model and who made it? |
Created by J.J Thompson An atom was a sphere of positive charge with negative electrons dotted around inside it. |
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What is Dalton theory about atoms? |
All matter is made of atoms and atoms are indestructible. A chemical reaction is the rearrangement of atoms. |
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How are electrons arranged? |
Electrons are arranged in shells around the nucleus. The first shell holds up to two electrons the rest hold up to eight. |
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How is the periodic table arranged? |
The metals are on the left and middle of the periodic table. The non metals are on the right. |
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How did John Newland arrange the elements in 1864? |
In order or relative atomic mass. This led to Newland putting some elements into groups which did not match chemical properties |
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How are elements arranged in the periodic table today? |
In order of atomic number so that elements with similar properties are in columns called groups. |
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Why are the group 0 elements unreactive/inert? |
They have full shells already |
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What are the group 0 elements also known as? |
The noble/inert gases |
