Isotopes and Isobars
Chemistry ⇒ Atomic Structure and the Periodic Table
Isotopes and Isobars starts at 8 and continues till grade 12.
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See sample questions for grade 11
A sample contains 70% ³⁵Cl and 30% ³⁷Cl. Calculate the average atomic mass of chlorine in the sample.
Calculate the number of neutrons in ⁵⁷Fe.
Define isobars with an example.
Explain why isobars have different chemical properties.
Explain why isotopes of an element have the same chemical properties but different physical properties.
Explain why the atomic masses of most elements are not whole numbers.
Give the number of protons, neutrons, and electrons in ¹⁸O²⁻.
State one difference between isotopes and isobars.
State one use of isotopes in medicine.
The atomic number of sodium is 11. How many protons and neutrons are present in ²³Na?
The two isotopes of chlorine are ³⁵Cl and ³⁷Cl. What is the average atomic mass of chlorine if their abundances are 75% and 25% respectively?
What are isotopes?
Which isotope of carbon is used in radiocarbon dating?
Which isotope of hydrogen is radioactive?
