Science Ch.4 Flashcards Preview

Science 7th Grade > Science Ch.4 > Flashcards

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

atom

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

2

electron

a subatomic particle that has a negative charge

3

nucleus

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

4

electron cloud

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

5

proton

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

6

atomic mass unit

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

7

neutron

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

8

atomic number

the number of protons in the nucleus of an atom

9

isotope

an atom that has the same number of protons

10

mass number

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

11

atomic mass

the mass of at atom expressed in atomic mass units

12

Dalton

fund that all elements combine to form compounds

13

Thomsons

founder of electrons

14

Rutherford

corrected Dalton's theory with the gold foil experitment

15

Bohr

discovered electron levels