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Scientists and philosophers unit 3
Dalton's atomic theory
Scientists Unit 5
Periodic Table
Periodic trends
100
He proposed that when elements combine, they do so in ratio of small whole numbers.
What did John Dalton propose about the Law of Multiple Proportions?
100
Atoms.
What tiny particles are all of matter composed of?
100
He called groups groups "triads".
Who is Johann Dobereiner?
100
Periods.
What are Horizontal rows called on the periodic table?
100
Atomic radius' and Metallic character's trend goes in that direction.
What trend goes to the left and down?
200
He discovered fire,air,earth,and water as the 4 elements all substances are made of.
Who is Aristotle?
200
Mass and other properties.
What differ among atoms of different elements?
200
He is the other person besides Mendeleev who published a table with elements arranged from increasing atomic mass.
Who is Lothar Meyer?
200
Groups or families.
What are vertical columns called on the periodic table?
200
Electron affinity's,Ionization energy's, and Nonmetallic character's trend goes in that direction.
What trend goes to the right and up?
300
He proposed the Law of Conservation of Mass
Who is Antoine Lavoisier?
300
Are identical in size,mass, and other properties .
What similarities do atoms of the same element have?
300
He suggested that elements be arranged in "octaves".
Who is John Newlands?
300
Alkali Metals are located in this group.
What is Group l?
300
It tends to become more negative from left to right.
What is Period trend?
400
He proposed the Law of Definite Proportions.
Who is Joseph Proust?
400
Subdivide,create, or destroy.
What can atoms not do?
400
He is the "father of the modern periodic table".
Who is Dimitri Mendeleev?
400
Alkaline metals are located in this group.
What is Group ll?
400
It decreases down a group.
What is group trend?
500
He called nature's basic particle an "atom".
Who is Democritus?
500
Compounds.
What are atoms called when they are combined with another atoms of another element?
500
He arranged elements from increasing atomic number.
Who is Henry Moseley?
500
This group is generally brittle and dull,poor conductors of heat and electricity.
What are nonmetals?
500
They tend to lose an electron.
What are Metals?