Download A. The modern atomic model is based on the principles of . B. Greek

Atoms
StudyGuide
7thgrade
A. Themodernatomicmodelisbasedontheprinciplesof_____________________.
B. Greekphilosopherswhostudiedthesmallestparticlesofmatterwerecalled
________________.
C. Theatomictheoryofmatterwasdevelopedby___________________.
D. Thepositivelychargedparticleinthenucleusofanatomisthe________________.
E. ThepassageofanelectriccurrentthroughagaswasusedbyJ.J.Thompsonin
experimentsthatledtothediscoveryofthe___________________.
F. Thenucleusofanatomwasfirstdiscoveredby_________________________.
G. Thetheorythatelectronarelocatedinspecificenergylevelswasfirst
proposedby_______________________.
H. Thenumberofprotonsinthenucleusiscalledthe______________________.
I. Thesumoftheprotonsandneutronsinthenucleusofanatomiscalledthe
________________________________.
J. Radioactivedecayiscausedbythe___________________________.
K. The______________________isthecenteroftheatom.
L. Atomsofthesameelementthathavethesamenumberofprotonsbut
differentnumberofneutronsarecalled_______________________.
M. Thesubatomicparticlesthatareneutralarecalled___________________________.
N. A(An)________________________isthenegativelychargedparticle.
O. Accordingtothemodernatomictheory,_______________________canmovefrom
oneenergyleveltoanother.
P. A___________________“glues”theprotonstogetherinthenucleus.
Q. _____________________________istheforceofattractionwhichexistsbetweenall
objects.
R. Theparticlessmallerthananatomarecalled_____________________particles.
S. Theatomic________________ofanelementneverchanges.
Name
AtomicNumber
MassNumber
Hydrogen
1
1
Helium
2
4
Carbon
6
12
Nitrogen
7
14
Oxygen
8
16
Fluorine
9
19
Sodium
11
23
Aluminum
13
27
Sulfur
16
32
T. Howmanyneutronsarefoundinanatomofaluminum?
U. HowmanyprotonsarefoundinanatomofFluorine?
V. Whatunitisusedtomeasurethemassofanatom?
W. Explainwhycarbonhasamassnumberof12andanatomicmassof12.011.