Who am I?

I believed that all things were created from tiny

indivisible particles.  I lived in Greece around 430 B.C.

Democritus

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Who am I?

I developed an early atomic theory during the late 1700's that stated atoms can combine with other

atoms ....but only in simple whole number ratios.

I was an English chemist and physicist.

John Dalton

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Who am I?

I was an English physicist who lived from 1856-1940.  I was the one who coined the phrase "electrons" and offered to my colleagues the "plum pudding" model of the atom.  My research findings were based upon

my observations and manipulations of the cathode ray.

J. J.  Thomson

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Who am I?

I was from England and discovered the subatomic

particle known as the neutron in 1932.  For my work

I received a Nobel Prize.

James Chadwick

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What is the name of the device shown in the picture below?

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The cathode ray that is found in a cathode ray tube is made up of?

a.   protons

b.  neutrons

c.  electrons

What is the name given to the positively charged metal

plate inside a cathode ray tube?

a.   protons

b.   cathode

c.      anode

c.  anode

What is the name given to the negatively charged metal

plate inside a cathode ray tube?

a.   protons

b.   cathode

c.      anode

Which subatomic particles are

found in the nucleus of an atom?

Which subatomic particle is found orbiting

the nucleus of an atom?

Neutrons are neutral.

They have NO charge.

True or False

Atoms are electrically neutral.

True or False?

The nucleus of an atom houses protons and neutrons.

The protons and neutrons have relatively the same mass, hence the mass of an atom is found within the nucleus.

True or False?

The nucleus of an atom is positively charged.

True.

Since protons are positive and neutrons are neutral, the atom's nucleus has an overall positive charge.