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7th Grade School-all subjects > science module 3 > Flashcards

science module 3 Flashcards

1
Q

what are atoms made up of?

A

protons, neutrons, electrons

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2
Q

how many elements are there?

A

118

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3
Q

Who was the first person to discover the atom?

A

Democritus in 485b.c.

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4
Q

Benjamin Franklin’s theory

A

positive and negative charges

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5
Q

John Dalton’s idea of an atom

A

a plain circle

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6
Q

J.J. Thompson’s idea of an atom

A

a pizza

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7
Q

ernest ruthford’s idea of an atom

A

the classic movie atom

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8
Q

Neil Bohr’s idea of an atom

A

the solar system

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9
Q

Erwin’s idea of an atom

A

a weird toxic blob

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10
Q

what are atoms?

A

the smallest piece of matter

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11
Q

what is the center of an atom?

A

the neclues

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12
Q

what is in the nucleus?

A

protons and neutrons

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13
Q

where is the electron in the atom?

A

electrons orbit around the nucleus, almost creating a shell

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14
Q

what is another word for the shell that electrons make around the nucleus?

A

the orbital

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15
Q

what makes up an individual atom?

A

the number of protons and neutrons

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16
Q

what is an atoms atomic number?

A

the number of protons and neutrons it has

17
Q

what contributes to the charge of an atom?

A

the protons and electrons

18
Q

how much larger are protons and neutrons than electrons?

A

2,000 times bigger

19
Q

how much does 1 proton weigh?

A

1 AMU

20
Q

How much does a neutron weigh?

A

1 AMU

21
Q

what is the average atomic mass of 19.28

A

19

22
Q

what is the average atomic mass of 18.97

A

19

23
Q

how did Mendeleev arrange his periodic table?

A

by increasing atomic weights, and left open spaces for more elements in the future

24
Q

What did the ancient Greek contribute?

A

the term “atom”

25
Q

What did Benjamin Franklin contribute?

A

“Like charges repel and opposite charges attract”

26
Q

What did John dalton contribute

A

created atomic theory of matter

27
Q

J.J. Thompsan contribute?

A

plum pudding model

28
Q

Ernest contribution

A

discovered protons, neutrons, and the nucleus

29
Q

Neils Contribution

A

determined that electrons are in shells or orbitals

30
Q

Erwin’s contributed

A

determined that electrons can jump from level to level

31
Q

properties of metals

A

conduct, shiney, ductile, solid

32
Q

properties of non metals

A

does not conduct, dull, gas (sometimes solid)

33
Q

properites of metalliod

A

sometimes conducts, sometimes solid

7th Grade School-all subjects (12 decks)

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