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15 Cards in this Set
- Front
- Back
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The four most common elements in living organisms are:
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O, C, H and N
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The nucleus of an atom contains:
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protons and neutrons
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Which of the following What are the 3 subatomic particles and what are their charges:
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Protons have a positive charge
Electrons have a negative charge Neutrons have no charge |
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What two subatomic particles make up the mass of an atom?
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protons and neutrons
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The atomic number of an atom is:
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the number of protons in the atom
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The further an electron is from the nucleus, the (greater, lower) its energy
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Greater
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The closer an electron is from the nucleus the (greater, lower) its energy
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Lower
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An isotope has more ________ than a typical atom
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neutrons
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The innermost electron shell of an atom contains how many electrons?
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2
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The outermost electron shell contains how many electrons?
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8
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True or False The atomic number is the same as the number of electrons in its base state
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True
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Atoms or groups of atoms that have become electrically charged by gaining or losing electrons are called
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ions
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The chemical bond formed when atoms share electrons is called
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Covalent bond
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A molecule with an electrical charge due to the unequal sharing of electrons by its atoms is called a
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polar molecule
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True or False The ability of water molecules to form hydrogen bonds with other water molecules is critical to the milder temperatures of coastal regions when compared to inland areas, evaporative cooling of skin surfaces, the movement of water from the roots of a tree to its leaves, and the lower density of ice compared to liquid water
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True
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