Core general chemistry concepts tested on the HESI A2 Chemistry module: atomic structure, bonding, reactions, and solutions.
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- What is atomic number?
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The number of protons in an atom's nucleus- What is mass number?
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The sum of protons and neutrons in an atom's nucleus- What charge does a proton carry?
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Positive- What charge does an electron carry?
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Negative- What charge does a neutron carry?
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No charge (neutral)- What are isotopes?
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Atoms of the same element with different numbers of neutrons- What are valence electrons?
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Electrons in an atom's outermost shell that determine its bonding behavior- What is a group on the periodic table?
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A vertical column of elements that share similar chemical properties- What is a period on the periodic table?
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A horizontal row of elements- What is a cation?
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A positively charged ion formed when an atom loses electrons- What is an anion?
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A negatively charged ion formed when an atom gains electrons- Atoms tend to gain, lose, or share electrons to achieve a full outer shell of ____ valence electrons.
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8- What is an ionic bond?
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A bond formed by the transfer of electrons, typically between a metal and a nonmetal- What is a covalent bond?
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A bond formed by the sharing of electrons, typically between nonmetals- What is a polar covalent bond?
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A covalent bond with unequal sharing of electrons due to a difference in electronegativity
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