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Module #3 Test...

QuestionAnswer
Law of Conservation of Mass Matter cannot be created of destroyed but it can change forms.
Law of Constant Composition Samples of a pure compound always have the same elements in the same mass proportions.
Atomic Number The number of protons in an atom.
Mass Number The sum of the protons and neutrons in the nucleus of a cell.
Isotopes Atoms of an element with the same number of protons but different numbers of neutrons.
Orbitals A region of space around the nucleus where electrons are most likely to be found.
Valence electrons Electrons that are in the highest energy level of an atom.
Where is almost all of the mass of an atom found? Nucleus.
What type of particle is an electron? A negative charge, found outside the nucleus.
All atoms of an element have the same..... Number of neutrons.
If elements have the same number of valence electrons they are..... In the same group.
What are the most reactive metals? Alkali metals.
Which elements are all gases. Group 8A
J.J Thomson's experiment provided what evidence about atoms? Atoms contain negatively charged particles.
Created by: user-1761993
 

 



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