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24 Cards in this Set
- Front
- Back
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What is the nucleus made up of? |
Protons and neutrons. |
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What is the shells outside around the nucleus? |
Electrons. |
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What do all atoms of an element have the same number of? |
Protons. |
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Why do atoms of an element have the same number of protons? |
They determine the element. |
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Out of protons, neutrons and electrons, which two have the same numbers in an atom? |
Protons and electrons. |
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Why do atoms have an overall neutral charge? |
The positive charge of the protons balances the negative charge of the electrons. |
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What is an isotope? |
Atoms of the same element (the same number of protons) with a different number of neutrons. |
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What is the relative mass of a proton? |
1 |
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What is the relative charge of a proton? |
+1 |
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What is the relative mass of a neutron? |
1 |
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What is the relative charge of a neutron? |
0 |
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What is the relative mass of an electron? |
1/1840 |
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What is the relative charge of an electron? |
-1 |
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In the modern periodic table, how are the elements arranged? |
In order of their atomic numbers. |
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On what hand side are the metals? |
Left |
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On what hand side are the non-metals? |
Right |
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what are elements with similar properties arranged in? |
The same group. |
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What do the groups also represent? |
The number of electrons in the atom's outer shell. |
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What are the horizontal rows called? |
Periods |
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What do the periods represent? |
The number of shells the atom has. |
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How did Mendeleev arrange the periodic first? |
According to their relative atomic masses. |
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Why did he end up swapping some places of elements? |
To make sure that properties lined up. |
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What else did Mendeleev do with his periodic table (excluding his arrangement and swapping)? |
He left gaps for undiscovered elements and predicated their properties. |
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How does the modern periodic table prove Mendeleev's predictions? |
The properties of the elements Mendeleev predicted were correct when they were discovered. |
