UNIT
3 VOCABULARY MATCHING
WORD BANK
(A)
electron (B)
neutron (C)
proton (D)
atomic number
(E) mass number (F)
isotope
(G) nucleus (H)
(I) electron cloud (J)
Thomson (K)
Bohr
(L)
____
1.)
center part of an atom; contains almost all of the
mass of an atom G
____
2.)
equal to the number of protons in an atom; whole
number on the Periodic Table D
____
3.)
equal to the number of protons plus the number of
neutrons in an atom E
____
4.)
discovered the electron using a cathode ray tube J
____
5.)
atoms of the same element, but have different masses F
____
6.)
negatively-charged subatomic particle A
____
7.)
part of the atom that surrounds the center; accounts
for almost all of the volume of an atom I
____
8.)
discovered the nucleus with the gold foil experiment L
____
9.)
positively-charged subatomic particle C
____
10.)
established that atoms of one element are not changed
into atoms of another element in a
chemical reaction H
____
11.)
hypothesized that electrons travel around the center
of the atom in particular paths K
____
12.)
subatomic particle with no charge B