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Chemistry part 1
periodic table regions, atom history
| Question | Answer |
|---|---|
| Alkali Metals | most reactive metals on the Periodic Table, have one valence electron, soft and shiny |
| Alkaline Earth Metals | have 2 valence electrons, very reactive metals |
| Transition Metals | elements in groups 3-12, good conductors of electricity, change from more reactive on the left to less reactive on the right |
| Metalloids | have characteristics of both metals and nonmetals, used as semiconductors |
| Rare Earth Metals | soft and shiny metals, elements 93 and up are synthetic |
| Halogens | most reactive nonmetals on the Periodic Table, have 7 valence electrons |
| Noble Gases | stable, don't normally form compounds, all exist in Earth's atmosphere |
| proton | positive particle in an atom |
| neutron | neutral particle in the nucleus of an atom |
| electron | negative particle that "orbits" the nucleus of an atom |
| electron cloud | region around the nucleus of an atom where electrons are likely to be found |
| valence electrons | located on the outermost energy level of an atom, involved in chemical bonding |
| Bohr model | atom drawing that shows energy levels where electrons reside |
| Electron Cloud model | more modern model of an atom, electrons reside in a region around the nucleus |
| John Dalton | credited with the solid, indivisible "marble" model of the atom |
| J.J. Thomson | credited with the "Plum Pudding" model of the atom that had a solid positive atom with negative particles embedded within it |
| Ernest Rutherford | credited with the "Nuclear" or "Planetary" model of the atom where electrons "orbit" the nucleus, atoms are made of mostly empty space |
| Niels Bohr | credited with the atom model where electrons "orbit" the nucleus in well-defined pathways |
| James Chadwick | credited with suggesting that neutrons have a neutral charge and reside in the nucleus of an atom with the protons |
| Edwin Shrodinger | credited with the "Electron Cloud" model of the atom where electrons orbit the nucleus randomly |
| Dmitri Mendeleev | created the first Periodic Table |
| stable | an atom can become this way when its outermost energy level is full of electrons |
| neutral | an atom can become this way if it has the same number of protons as electrons |
Created by:
lfurrow13
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