Atomic Structure
Name ________________
1) The nucleus of an atom contains positively charged _____________________________.
2) The nucleus of an atom may also contained uncharged __________________________.
3) How do the masses of the proton, neutron, & electron compare to each other?
4) An ‘average’ atomic nucleus has a radius of ________________________ meters.
5) The ______________ of an atom determines its chemical behavior, but the _______________
determines its mass.
6) The ____________________ number of an atom indicates the number of protons present in the atom.
7) The ____________________ number of an atom indicates the total number of protons + neutrons
present.
8) For a neutral atom, the number of protons & _____________________ must be the same.
9) Write the atomic notation (AZXcharge) for each of the particles described below.
a) 8 protons, 9 neutrons, 10 electrons.
b) neutral element # 92 with 146
neutrons
c) the isotope of iron with 30 neutrons and 23 electrons
d) atomic # = 19, mass # = 39,
18 electrons
10) Which pair(s) of particles have the same number of neutrons?
a) 12C 14C
b) 12C 13N
c) 108Ag 108Sn
d) 2H 1H
11) Write in the atomic notation, the number of protons, neutrons, and electrons that each of the following
particles has from the clues given.
atomic not.
protons
neutrons
electrons
27 Al
13
______
_______
_______
_________
__51__
__73___
__47___
40 Ar
18
______
_______
_______
80 Br-1
35
______
_______
_______
_________
__11__
__12___
__10___
40 K+1
19
______
_______
_______
_________
__15__
__16___
__18___
_________
__15___
__16___
__10___