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Download counting atom parts.xlsx
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Counting the Parts of an Atom Name: _______________ Circle the atomic number: 38 Sr 87.62 Circle the atomic mass: 41 Nb 92.9 The letters used to identify elements are called: chemical symbols How do you know the number of protons in an atom? The number of protons is always equal to the atomic number of an element This is the number of protons in the nucleus How do you know the number of electrons in an atom? The number of electrons are the same as the atomic number HOWEVER, this can change if the atom is an ion How can you solve for the number of neutrons in an atom? The atomic mass represents the number of protons and neutrons in the nucleus To find the number of neutrons, subtract the atomic number from the atomic mass Fill out the blank spaces on this chart: Element Chemical Symbol Atomic Number beryllium Be 4 Number of Number of Number of Protons Electrons Neutrons 4 4 flourine 6 lead 29 1 5 9 10 19 12 chlorine gold Atomic mass (rounded)
