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Matter Miller JMS

Matter test for Mrs. Miller at Jackson Middle school by Christian Stepp

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