Question
Determine the mass number of (a) a beryllium atom with 5 neutrons, (b) a sodium atom with 12 neutrons, (c) a selenium atom with 44 neutrons, and (d) a gold atom with 118 neutrons.
Step 1
The atomic number is equal to the number of protons in an atom. (a) Beryllium (Be) has an atomic number of 4, which means it has 4 protons. (b) Sodium (Na) has an atomic number of 11, which means it has 11 protons. (c) Selenium (Se) has an atomic number of 34, Show more…
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