Identify the missing information for each atom or ion. Note that the atoms and ions are not necessarily neutral.   A)   A SeSe ion has a mass number of 77 and a charge of −2. Determine the number of neutrons, protons, and electrons in this ion.   Number of neutrons: Number of protons: Number of electrons:   B)   An ion has a mass number of 65, 36 neutrons, and a charge of +1. Identify the element symbol, and determine the number of protons and electrons in this ion.   Element symbol: Number of protons: Number of electrons:   C)   An atom or ion has 41 neutrons, 36 protons, and 36 electrons. Identify the element symbol, and determine the mass number and charge for this atom or ion.   Element symbol: Mass number: Charge:

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.