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.(8)(O)^(16) and .(8)(O)^(18)are isotpes...

`._(8)(O)^(16) and ._(8)(O)^(18)`are isotpes while `._(20)(Ca)^(40) and ._(18)(Ca)^(40)` are isobars.

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To solve the question regarding isotopes and isobars, let's break it down step by step. ### Step 1: Understanding Isotopes Isotopes are atoms of the same element that have the same atomic number but different mass numbers. This means they have the same number of protons but a different number of neutrons. **Example:** - Oxygen isotopes: - \(_{8}^{16}O\) (Oxygen-16) has 8 protons and 8 neutrons (16 - 8 = 8). ...
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