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Atomic Theory
The Atom
Isotopes
Grouping the Elements
Review
100
Greek Philosopher who said the smallest particles of matter are called ATOMS
Democritus
100
Atoms are mostly __________ space.
empty
100
Every element has at least _____________ isotope.
one.
100
Families in the Periodic Table are grouped by ___________________
chemical properties.
100
Look at your periodic table. C # protons______ # electrons ______ Atomic Mass - Atomic Number__________ = Neutrons ___________
6, 6, 12.01, 6, 6
200
Danish scientist who discovered that electrons move around the nucleus in orbits
Bohr Model
200
Most of the atom's ___________ is found in the __________.
weight, nucleus
200
Isotopes are atoms that have the same __________ but have a ______________.
same number of protons but different number of neutrons.
200
Valence Electrons are ________________.
Number of electrons on the most outer energy level.
200
Look at your periodic table. Na # protons______ # electrons ______ Atomic Mass - Atomic Number__________ = Neutrons ___________
11, 11, 23, 11, 12
300
German scientist who discovered that electron cloud.
What is Schrodinger and Heisenber
300
The first energy level can hold up to ______ electrons.
2
300
Some Isotopes are unstable or radioactive because the nucleus _____________.
falls apart
300
What is the 8 full Rule.
8 valence electrons on the second energy level.
300
Look at your periodic table. Y # protons______ # electrons ______ Atomic Mass - Atomic Number__________ = Neutrons ___________
39, 39, 89, 39, 50
400
Russian scientist who developed the first periodic table.
Dmitri Mendeleev
400
The _____________ is the number of_________.
atomic number, protons
400
Atomic Mass is an ____________ of all Isotope mass numbers.
average
400
A an element is in group 2(2a) how many valence electrons does it have?
2
400
Look at your periodic table. P # protons______ # electrons ______ Atomic Mass - Atomic Number__________ = Neutrons ___________
15, 15, 30.97, 15, 16
500
British scientist who discovered the Plum-Pudding Model.
JJ Thomson
500
The ____________ is the sum of the ___________ and _____________.
Atomic mass, protons and neutrons.
500
List three similarities between isotopes.
o The same number of protons (p+). o The same number Atomic Number. o The same number of electrons (e-).
500
If the element is in group 3-12, how many electrons does it have?
varies
500
Look at your periodic table. Se # protons______ # electrons ______ Atomic Mass - Atomic Number__________ = Neutrons ___________
34, 34, 79, 34, 45