chemastry chapter 3
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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| atom | a basic unit of matter that consists of a dense, central nucleus surrounded by a cloud of negatively charged electrons.
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| plum-pudding model | the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively-charged "plums" surrounded by positively-charged "pudding".
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| gold-foil experiment | he shot a very thin peice of gold foil with a stream of postively charged particles known as the alpha particles. he found that most of the alpha particles passed sraight through the foil.
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| orbitals | the aria of space an electron takes up
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| nucleus | consists of protons and neutrons
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| proton | positavly charged electron
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| neutron | negetavly charged electron
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| mass number | the total number of protons and neutrons
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| atomic number | is the number of protons found in the nucleus of an atom
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| ion | an atom or molecule that has gained or lost one or more electrons
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| isotopes | are different types of atoms of the same chemical element, each having a different number of neutrons
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| atomic mass | is the mass of a specific isotope of a given atom, most often expressed in unified atomic mass units
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| valence electrons | determns how the atom reacts chemically with other atoms.
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| octet | Group of eight valence electrons surrounding an atom.
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| excited state | state in which an atom or molecule picks up outside energy
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| ionization energy | the minimal energy required to remove an electron from the atom
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| electron affinity | the energy change when an electron is added to the neutral species
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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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.
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:
CLongwell
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