Atoms And The Periodic Table Flashcards
Who made the earliest suggestion that atoms might exist in 5th century BC
Democritus
Who expanded the idea that the differences between substances were the direct results of differences in size and shape of tiny, uniform, uncuttable particles
Democritus
What are the four properties
Moist, dry, cold and hot
What are the four major elements
Water, air, fire and earth
What was the early Greek periodic table?
Air water fire earth-moist cold dry hot
Which theories were essentially philosophical and moralistic in nature with no experimental work?
Aristotle, Greek
3 early laws of chemistry
The law of definite proportions
The law of multiple proportions
The law of conservation of mass
Who was the first to believe that elements are made up of extremely small particles called “atoms”?
John Dalton
Who discovered the electrons?
J.J. Thomson
Who proved that the nucleus was surrounded by a “cloud” of negatively charged electrons?
Sir Ernest Rutherford
Who assigned atomic numbers to elements?
Moseley
Who discovered the neutron that was predicted by Rutherford?
Chadwick
“Electrons orbit at a fixed distance from the nucleus”
Niels Bohr
A set of elements in a given column going up and down the periodic table are a
Family
A set of elements in a given row across the periodic table are a
Period
Elements with 1+ ions
Alkali metals
