science test 1/9/08

Created by jellybellybean94 

Upgrade to
remove ads

Democritus was

greek

John Dalton was from what hundreds?

1800s

gases______as if they were made of individual particles

combine

all elements are composed of

atoms

what is indivisible and indestructible

atoms

atoms of the _______ element are exactly alike

same

atoms of ___-elements are different

different

how are compounds formed?

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

J.J. Thompson

1897

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

1908

what did ernest rutherford discover?

there was a nucleus in an atom

Niels Bohr

1913

Ernest Schrodinger

1926

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

Democritus

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

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set