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14 Cards in this Set
- Front
- Back
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What are the 4 major states of matter?
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Liquid, solid gas and plasma
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Who is John Dalton and why is he great?
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He was an English scientist who was a pioneer in the research into our modern theory of the atom.
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Whos' theory is the 'plum pudding' model of atoms
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JJ Thompson
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What is in the Nucleus of an atom
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A proton and a neutron
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Where the hell is the electron then??
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It's in the electron cloud surrounding the nucleus
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Whats the mass of an electron
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1/1840
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What defines a chemical element?
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The number of protons in an element
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What is the atomic number equal to?
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The proton number
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Define relative atomic mass?
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The (relative) atomic mass of an atom is the average mass of the atoms of the element compared to an atom of carbon which has a mass of 12 amu (atomic mass units).
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What are the vertical columns called in a periodic table also known as?
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Groups
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Whats the horizontal rows called in a periodic table known as?
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Periods
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Are metals to the left or the right in the periodic table?
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To the left
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What is group 1a called in the periodic table and what properties have they got?
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alkali metals, Good conductors of electricity
•Soft enough to cut with a knife •Very light •Extremely electropositive. •Low melting points, these decrease with increasing atomic mass. •All react with cold water to liberate hydrogen gas and to form metal hydroxides. |
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What are noble gases?
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Very stable elements
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