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35 Cards in this Set
- Front
- Back
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____ ______ propose an atomic theory of matter based on experimental evidence.
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John Dalton
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Dalton's atomic theory is _____.
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all matter is made up of tiny particles called atoms.
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The nucleus of an atom is made up of ___ and ____.
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protons and neutrons
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The subatomic particles that circle around the atom's nucleus are called ____.
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electrons
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The path around the nucleus an electron makes is called its ______.
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orbit
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The orbit is also called the ___ _____.
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energy level
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What is the energy level?
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The distance the electron is from the nucleus.
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A _____ is a subatomic particle with a positive charge.
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proton
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A ____ is a subatomic particle with a negative charge.
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electron
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A____ is a subatomic particle with no charge.
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neutron
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The mass of a proton is nearly _____ times the mass of an electron.
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2,000
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___ and ____ have about the same mass.
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protons and neutrons
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If an atom has more protons than electrons, it has a ___ charge.
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positive
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If an atom has more electrons than protons, it has a ___ charge.
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negative
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An atom with the same number of protons and electrons is called a ______ atom.
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neutral atom
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An _________ is a substance made up of only one kind of atom.
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element
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The ________ _________ represents the number of protons in one atom of an element.
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atomic number
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If an element has the atomic number 39, how many protons does it have in its nucleus?
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39
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Two or more atoms linked together will form a ___.
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molecule
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What are the 5 properties of metals?
1 2 3 4 5 |
1. luster
2. malleable 3. ductile 4. conduct electricity 5. conduct heat |
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Materials that do not conduct electricity are known as ____.
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insulators
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An_________ is a mixture of metals.
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alloy
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Name an example of an alloy.
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bronze, brass or steel
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___ _____ first organized elements by their atomic masses, making the first periodic table.
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Dmitri Mendeleev
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The modern day periodic table is organized based on the element's ___ _____.
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atomic number
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The periodic table groups elements based on ______ properties.
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similar
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The arrangement of electrons in the energy levels gives the element its ______ properties.
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chemical properties
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Some elements have properties of both metals and nonmetals -these elements are known as ___.
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metalloids
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About ___ of the elements are metals.
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3/4
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On the periodic table, each element has an abbreviation called a ___ ____.
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chemical symbol
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A ______ is a substance made of atoms of two or more elements.
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compound
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_____ is the most common compound.
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water
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A ____ _____ shows which elements and how many of each are in a compound.
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chemical formula
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When atoms join to form a compound, they undergo a ____ change.
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chemical
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When hydrogen and oxygen are combined, what new product is formed?
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water
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