chapter 4 chemistry
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| dalton's atomic theory | dalton formulated hypotheses and theories to explain his observation--- elements are made of atoms, they can combine together to make compounds, atoms of the same element are the same, you need chemical reactions to seperate compounds | water is made of hydrogen and oxygen
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| electron | negatively charged subatomic particles on the outside | discovered by JJ Thompson in 1897
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| cathode ray | glowing beam | how he discovered the electron
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| proton | positively charged subatomic particles | discovered by goldstein
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| neutron | subatomic particles with no charge but with a mass nearly equal to that of a proton | discovered by Chadwick
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| nucleus | tiny central core of an atom and is composed of protons and neutrons | majority of the mass ,discovered by Rutherford
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| atomic number | number of protons in the nucleus of an atom of that element | oxygen--- atomic # 8---
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| mass number | the total number of protons and neutrons in an atom | hydrogen-1- number at the end is mass number
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| isotopes | atoms that have the same number of protons but different numbers of neutrons | 1+2=3
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| atomic mass unit (amu) | defined as one twelfth of the mass of a carbon-12 atom | the decimal points numbers
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| atomic mass | weighted AVERAGE mass of the atom in a naturally occurring sample of the element | THE AVERAGE MASS
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| atom | smallest particle of an element that retains its identity in a chemical reaction | hydrogen--- hydrogen atoms, oxygen----oxygen atoms
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
candye12
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