asp 1-B THE STRUCTURE OF MATTER
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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| Atomic mass | The average mass of the naturally occurring isotopes in the sample of an element
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| Atomic mass unit | A unit equal to 1/12 the mass of a carbon-12 atom
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| Atomic number | The number of protons in the nucleus of an atom
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| Cathode-ray tube | Two metal electrodes in an evacuated glass tube
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| Coulombs | The unit for measuring electric charge
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| Electrons | Negatively charged particles that have very little mass but take up most of the space in an atom; found orbiting outside the nucleus of the atom
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| Energy level | Any of the various levels in the shell model of the atom where electrons are found
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| Isotopes | Atoms of the same element that have different numbers of neutrons
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| Mass number | The total number of protons and neutrons in the nucleus of an atom
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| Molecular mass | The sum of the atomic masses of the atoms in a molecule
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| Neutrons | Particles that have no charge and have a slightly greater mass than a proton; located inside the nucleus
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| Protons | Positively charged particles that have more than 1800 times the mass of an electron, but take up very little of the volume of the atom; located inside the nucleus
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| Valence electrons | The electrons in the highest energy level in the shell model of an atom
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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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