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10 Cards in this Set
- Front
- Back
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The nucleus.. |
the middle of the atom. Contains protons and neutrons - overall positive charge. |
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The electrons.. |
move around the nucleus, negative charge, tiny compared to the nucleus. No mass. Occupy shells around the nucleus. |
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neutral atoms have.. |
no overall charge |
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electrons ALWAYS occupy .. |
shells. If the outer shell is not full = what to react |
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what does the atomic number (one at the bottom mean).. |
how many protons are in the atom, also the number of electrons as it is the same as the protons |
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the top number is the MASS NUMBER.. |
and it tells us the number of protons and neutrons |
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An isotope is .. |
different atomic forms of the same element, which have the SAME number of PROTONS but different number of NEUTRONS |
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In the periodic table elements are put in order of there.. |
atomic mass |
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In 1869 what did Madeleev do? |
made a table of known elements, placing them according to their properties of compounds. He left gaps in the table, for the unpredicted elements |
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metals and non-metals are on opposite sides of the periodic table.. |
arranged into periods and groups. Periods - are the rows. Groups - are downwards columns |
