Science Ch.4 Flashcards Preview

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Flashcards in Science Ch.4 Deck (15)
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1
Q

atom

A

the smallest unit of an element that maintains the properties of that element

2
Q

electron

A

a subatomic particle that has a negative charge

3
Q

nucleus

A

in physical an atoms central region which is mad up of protons and neutrons

4
Q

electron cloud

A

a region around the nucleus of an atom where electrons are most likely to be found

5
Q

proton

A

a subatomic particle that that has a positive charge and that is found in the nucleus of an atom

6
Q

atomic mass unit

A

a unit of mass that describes the mass of an atom or molecule

7
Q

neutron

A

a subatomic particle that has no charge and its found in the nucleus of an atom

8
Q

atomic number

A

the number of protons in the nucleus of an atom

9
Q

isotope

A

an atom that has the same number of protons

10
Q

mass number

A

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

11
Q

atomic mass

A

the mass of at atom expressed in atomic mass units

12
Q

Dalton

A

fund that all elements combine to form compounds

13
Q

Thomsons

A

founder of electrons

14
Q

Rutherford

A

corrected Dalton’s theory with the gold foil experitment

15
Q

Bohr

A

discovered electron levels