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- author "Flako"
- tags "Biology"
- description "Notes from Biology for EOC test"
- fileName "Chemistry"
- freezingBlueDBID -1.0
- Everything in the universe is composed of...
- Matter
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Matter is..
Anything that occupies space oe has mass
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An element is...
A pure substance that cannot be broken down chemically into simpler kinds of matter
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There are more than ______ elements
100
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90% of mass of an organism is composed of 4 elements, what were they?
Oxygen, carbon, hydrogen, & nitrogen
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Atoms are...
The simplest particles of an element that retains all the properties of that element
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What consist of an atom?
Protons, Neutrons, and Electrons
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Nucleus are
- - central core
- - consists of positive (+) charged protons & neutral neutrons
- - positively charged
- - contains most of the mass of the atom
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All atoms have the same number of...
Protons
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Number of protons called...
The atomic number
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Number of electrons is...
balanced by an equal # of electrons
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Number of neutrons varies slightly among..
Atoms of the same element
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Protons and Neutrons have a mass of...
1 amu (atomic mass unit)
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Atomic mass =
Protons and Neutrons
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Electrons are...
Negatively charged high energy particles with little or no mass
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How many energy levels dotes an atom have?
7
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The levels are
K (closest to nucleus), L, M, N, O, P, Q (farthest to nucleus)
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Level K can only hold ___ ; Levels L to Q can hold ____
2 ; 8
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