MediumChemistryHigh School (9–10)GeneralStructure of the Atom › Isotopes and IsobarsConceptualBoard Exam
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
Have you tried it?
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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