Praxis 2 Biology Content Knowledge 300+ Questions and Answers
atomic number all atoms of a particular element have the same unique number of protons mass number sum of all the protons and neutrons in its nucleus atomic mass about equal to its mass number the sum of its protons and neutrons isotopes same number of protons and electrons and behave identically in chemical reactions but they have different number of neutrons ion atom or molecule with an electrical charge from gain/loss of neutrons ionic bond STRONG: 2 ions with opposite charges attract each other and hold together chemical bond 2 atoms with incomplete outer shells react each atom shares/donates or receives outer electrons both have complete outer shells covalent bond STRONG: atoms share 1 outer pair of outer shell electrons molecules 2+ atoms hold together by covalent bonds double bonds sharing multiple pairs of electrons non polar covalent bonds electrons are shared equally between atoms polar molecule unequal distribution of charges (H20) polar covalent bond unequal sharing f electrons
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