Matter Miller JMS Word Scramble
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Question | Answer |
Element | Matter that is made up of only one kind of atom. Abt. 90 occur naturally, total of about 115 |
Periodic Table | chart used by chemists to organize and display elements. |
Row | period |
atomic number | top number in element symbol and the number of protons |
mass number | total of protons plus nuetrons |
isotope | atoms of the same element that have different number of neutrons |
atomic mass | weighted average mass of the isotopes of an element |
metals | elements that form ions by giving up electrons, have shiny metallic luster, malleable, good conductors, ductile, (most elements are metals) |
nonmetals | found on right side of periodic table, except Oxygen, are brittle, form negative ions, important for life (97% of your body is nonmetals) |
metalloids | stair step between metals and nonmetals can form positive or negative ions |
Democritus | Greek Philosopher who reasoned that there must exist a smallest or indivisible piece of an elelment |
Lavoisier | French scientist who from 1600's who formed the law of conservation of matter |
John Dalton | English teacher from 1800's formed model in which each type of matter was formed by only one kind of atom. Model was called the atomic theory of matter |
JJ Thompson | (early 1800's) English scientist discovered electron. (chocolate chip cookie model) |
Rutherford | (1910) famous gold foil experiment discovered the nucleus |
James Chadwick | (1910's) student of Rutherford, discovered the nuetron |
Neils Bohr | (early 20th century) discovered that electrons are arranged in different energy levels |
Modern Atomic model | show electrons moving around the nucleus in an electron cloud |
Malleable | can be bent or pounded in different shapes |
Ductile | can be drawn into wire without breaking |
brittle | cannot be bent or pounded into different shapes easily without breaking |
columns | called groups - elements in the same column have similar properties |
rows | called periods - elements in the same row have the same number of energy levels |
Created by:
criswell216
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