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Biology flash cards

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QuestionDefinition
Element A substance that cannot be broken down into simpler substances by chemical reactions.
Atom Smallest possible unit of an element that retains the physical and chemical properties of its element.
Neutron No charge
Proton +1 Charge
Electron -1 Charge, Light negatively charged particles that orbit around nucleus.
Subatomic particles Proton, Electron, and Neutron
Atomic number Number of protons in an atom of a particular element.
Atomic mass Number of protons and neutrons in an atom
Isotopes Atoms of an element that have the same atomic number but different mass number.
Chemical bonds The attraction, sharing, or transfer of outer shell electrons from one atom to another that hold molecules together.
Molecules made of atoms that have combined chemically.
Compound molecules made from more than one type of atom.
Structural formula Formula which represents the atoms and bonding within a molecule (e.g., H-H). The line represents a shared pair of electrons.
Molecular/chemical formula Formula which indicates the number and type of atoms (e.g., H2)
Covalent bond Chemical bond between atoms formed by sharing a pair of valence electrons.
Double covalent bond Bond formed when atoms share two pairs of valence electrons (e.g., 02).
Triple covalent bond Bond formed when atoms share three pairs of valence electrons
Electronegativity Atom's ability to attract and hold electrons.
Nonpolar covalent bond Covalent bond formed by an equal sharing of electrons between atoms.
Polar covalent bond Covalent bond formed by an unequal sharing of electrons between atoms.
Ion Charged atom or molecule.
Ionic bond Bond formed by the electrostatic attraction after the complete transfer of an electron from a donor atom to an acceptor.
Created by: saikha3
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