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Science > Unit 2 > Flashcards

Unit 2 Flashcards

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1
Q

What is an atom

A

The smallest unit of matter

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2
Q

What is a proton

A

Have positive charge located in the nucleus and determine the identity

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3
Q

What is a nuetron

A

Nuetral charge located in the nucleus and stabilizes the atom

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4
Q

What is an electron

A

Negative charge located in the outer shell and determines the reactivity of an atom

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5
Q

What is the total charge of an atom

A

Neutral

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6
Q

What is the atomic number equal to

A

Protons and electrons

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7
Q

Mass number is equal to

A

Atomic mass

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8
Q

What did Democritus say

A

Matter can not be divided infinitely

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9
Q

What did dalton say

A

Atom contains electrons

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10
Q

What did jj Thompson create

A

Plum pudding model

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11
Q

Why did Rutherford discover

A

Nucleus

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12
Q

What is mol

A

Si unit for material equality

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13
Q

What are valence electrons

A

The electrons in the outermost she’ll of an atom

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14
Q

How is the modern periodic table arranged

A

Increasing atomic number

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15
Q

Who developed the first periodic table

A

Mendeleev

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16
Q

Who developed the modern periodic table

A

Henry mosely

17
Q

What is a group on the periodic table and what do they have in common

A

A vertical line; same number of electrons

18
Q

What is a period on the periodic table

A

A horizontal line

19
Q

Where are alkaline metals located

A

The first family

20
Q

Why are noble gasses inert

A

They have full outermost

21
Q

What are the two periods at the bottom of the table

A

Lanthanide, actinide

22
Q

What are the most reactive metals

A

Alkaline

23
Q

What is ionization energy

A

The amount of energy to form an ion

24
Q

What happens to ionization energy

A

Increases

25
Q

What happens to atomic radius

A

Decreases

Science (6 decks)

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