atoms Flashcards

1
Q

atom

A

smallest piece of matter

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2
Q

nucleus

A

positively charged center of the atom

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3
Q

protons

A

particles with electrical charge of 1+

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4
Q

neutrons

A

neutral particles in the atom

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5
Q

electrons

A

particle with electrical charge of 1-

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6
Q

quarks

A

smaller particles that make up neutrons and protons

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7
Q

democritus

A

first person to propose the ideas of everything is made of up atoms

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8
Q

Joseph thomson

A

he thought electrons were evenly embedded throughout a positively charged sphere

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9
Q

John dalton

A

he was able to offer proof that atoms exist

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10
Q

Ernest rutherford

A

though that almost all the mass of an atom and its positive charges were concentrated in a central atomic nucleus surrounded by neutrons

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11
Q

Niels bohr

A

hypothesized that electrons traveled in a fixed orbit around the atoms nucleus

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12
Q

electron cloud

A

area around the nucleus of an atom where the electrons are most likely found

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13
Q

atomic number

A

number of protons in an atom is equal to a number

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14
Q

mass number

A

the sum of the number of protons and the number of neutrons in the nucleus of an atom

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15
Q

isotopes

A

atoms of the same element have different numbers of neutrons

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16
Q

average atomic mass

A

weighted average mass of the mix of its isotopes

17
Q

periodic table

A

arrangements of elements

18
Q

henry Moseley

A

changed the arrangment of the periodic table based on their increasing atomic numbers

19
Q

Dmitri mendeleev

A

creator of periodic table

20
Q

groups

A

verticle columns in periodic table

21
Q

electron dot diagram

A

uses the symbol of the elements and dots to represent the electrons in the outer energy level

22
Q

periods

A

horizontal row of elements on the periodic table