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Democritus was


John Dalton was from what hundreds?


gases______as if they were made of individual particles


all elements are composed of


what is indivisible and indestructible


atoms of the _______ element are exactly alike


atoms of ___-elements are different


how are compounds formed?

they are formed by the joining of atoms of two or more elements

J.J. Thompson


what did J.J. Thompson say about atoms

he said they are made of smaller particles

what model did J.J. Thompson create?

plum pudding model

what was the plum pudding model

positively charged particles that were like pudding

Ernest Rutherford


what did ernest rutherford discover?

there was a nucleus in an atom

Niels Bohr


Ernest Schrodinger


what did Ernest Schrödinger say about the electrons

it is impossible to determine the exact location of electrons

who said this... mater can not be divided into smaller and smaller pieces forever


who said this... all elements are composed of atoms. they are indivisible and indestructible particles.

John Dalton

who said this... atom is made of pudding like material throughout which negetively (electrons) charged particles are scattered, like plums in a pudding

J.J. Thomson

who said this... all of the positively charged particles (protons) are in the nucleus. electrons are scattered around the nucleus and edge of an atom

Ernest Rutherford

where are protons located?

in the nucleus

where are electrons located

around the nucleus

which model said electrons move in definite orbits around the nucleus?

Bohr model

what does today's atomic model what dos it say about an atom's nucleus

it is a small positively charged nucleus

since the nucleus is surounded by a lot of electrons which have a negative charge, what happens to an atom?

it becomes neutral. it is balanced out between positive charge and negative charge

what are the 3 subatomic particles in alpha order?

electrons, neutrons, protons

neutrons have what charge?

neutral charge

what is the number of protons in the atom called?

atomic number

what is the sum of protons and neutrons in an atom's nucleus?

mass number

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