2. Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons.
3. Electrons
4. Titanium- Ti
5. a. e and p = 35, n = 45
b. e and p = 46, n = 60
c. e and p = 55, n = 78
6. Barium - atomic number = 56 and mass = 138
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