physical science PS.2 - Matter

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Last updated 2:06 PM on 12/30/22
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25 Terms

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Atomic theory
The scientific theory that matter is made up of atoms
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Erwin Schrödinger’s Model
The electron cloud model; our current understanding of atoms
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Bohr’s model is ___
Inaccurate
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Atoms are the ___
basic building blocks of all matter
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The nucleus of an atom is ___
dense
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What two particles of an atom are inside the atomic nucleus?
protons and neutrons
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What is in the space outside of the nucleus?
Electrons
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Atoms are held together by ___
electromagnetic forces
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Properties of atoms are based on ___
the atomic number and arrangement of parts inside an atom
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What are the 3 subatomic particles in an atom?
Protons, neutrons, and electrons
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What is the mass of 1 proton (in AMU)?
1 AMU
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What is the mass of 1 neutron (in AMU)?
1 AMU
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What is the mass of 1 electron (in AMU)?
1/2000 AMU or 0.00055 AMU
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What is the charge of a proton?
Positive
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What is the charge of a neutron?
Neutral
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What is the charge of an electron?
Negative
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The organization of the periodic table can be used to ___
predict characteristics and tendencies of elements
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What are the __*vertical columns*__ in the periodic table called?
Groups
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What are the __*horizontal rows*__ in the periodic table called?
Periods
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What is a similarity of the elements in a group?
Same number of valence electrons and similar chemical properties
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What is a similarity of the elements in the same period?
the same number of energy levels
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What is the theory that says that atoms & molecules are always in motion and have kinetic energy that increases when raising the temperature?
the kinetic molecular theory
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Where are __metals__ on the periodic table?
the left
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Where are __nonmetals__ on the periodic table?
the right
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Where are metalloids on the periodic table?
the “staircase”