Five atoms are given as (Z, A): P (6, 12), Q (6, 14), R (7, 14), S (8, 16) and T (8, 18).
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Five atoms are given as : P , Q , R , S and T .
- Name two pairs that are isotopes.
- Name a pair that are isobars.
- Which pair has the same number of neutrons?
Need a reminder? The key ideaShow
Isotopes are atoms of the same element, with the same and a different . They have the same electrons, so the same chemical properties. Isobars are atoms of different elements with the same and a different . The mass of a molecule is the sum of the masses of its atoms.
The worked solution
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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Isotopes. P and Q (both , carbon), and S and T (both , oxygen).
Step 2. (b) Isobars. Q and R (both ).
Step 3. (c) Neutrons. P , Q , R , S , T . Q and S both have .
Answer: (a) P and Q; S and T. (b) Q and R. (c) Q and S.
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