science Flashcards

1
Q

Atoms means..

A

uncuttable, smallest possible pieces

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2
Q

atomic theory grew due to…

A

a series developed from epirmental evidence

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3
Q

Dalton infersthat atoms…

A

had certain charateristics

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4
Q

every compound is composed of…

A

atoms of different elements in a specific ratio

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5
Q

Who found that atoms contain negatively charged particles?

A

J.J. Thhomson

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6
Q

What has no electrical charge?

A

atoms

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7
Q

If Thomson was correct the charged particles would…

A

pass through foil in a straight line

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8
Q

Like charges..

A

Repel eachother

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9
Q

Bohrs model shows that electrons…

A

only had specific amount of energy leading to them to certain orbits (like an onion)

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10
Q

An electroms movement is related to its…

A

energy level/specific amount of energy

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11
Q

Who discovered neutrons?

A

James Chadwick

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12
Q

Neutrons almost has the same mass as a…

A

proton

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13
Q

Modern atomic model describes that an atoms…

A

is mostly empty space

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14
Q

True or false: In an atom, protons # doesn’t = electrons #

A

False, protons#= electrons #

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15
Q

Charges balance out which makes…

A

the atom neutral

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16
Q

The amount of neutrons is about the same as…

A

the number of protons

17
Q

a protons mass is equal to a _____ which is equivalent to _____

A

Neutrons mass; 1 AMU

18
Q

Proton +neutrons mass = ?

A

Atom’s mass

19
Q

Isotopes are atoms of..

A

the same element with different numbers of neutrons

20
Q

isotopes are identified by…

A

their mass number/sum of protons+neutrons in a nucleus atom