Atomic Theory and Atomic Structure

Building block of matter is called

• neutron

• atom

• electron

• quarks

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Most of the mass of an atom is contained here.

• electron cloud

• nucleus

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What is the atomic mass for Nitrogen?

• 7

• 21

• 14.007

• 7.007

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How many electrons are in a neutral Uranium (U) atom?

• 238.03

• 92

• 146

• 330

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How many electrons are in a neutral Sulfur (S) atom?

• 32.065

• 32

• 16

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Which scientist is responsible for first discovering that all the atoms of a particular element are identical but are different from the atoms of all other elements?

• Dalton

• Thomson

• Bohr

• Rutherford

Dalton's model was a solid sphere with no subatomic particles. What was the nickname for this model?

• Billiard Ball Model

• Empty Space Model

• Planetary Model

• Plum Pudding Model

Who discovered a particle in the nucleus with no charge called the neutron?

• Chadwick

• Bohr

• Rutherford

• Dalton

Why has the model of an atom changed over time?

• Scientists discovered new information about atoms over time.

• Scientists couldn't agree on what the atom looked like.

• Atoms today are different than they were for Democritus in Greece.

• Atoms are always changing and may be different in the future.

What is the nickname for Bohr's model?

• Planetary model

• Electron cloud model

• Billiard ball model

• Nuclear model