Isotopes and Isobars

Chemistry ⇒ Atomic Structure and the Periodic Table

Isotopes and Isobars starts at 8 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Isotopes and Isobars. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 12

A sample contains 75% ³⁵Cl and 25% ³⁷Cl. Calculate the average atomic mass of chlorine.

A scientist finds two atoms: Atom X has 17 protons and 20 neutrons, Atom Y has 18 protons and 19 neutrons. Are they isobars?

Calculate the number of neutrons in ¹⁴N.

Calculate the number of neutrons in ⁴⁰Ar.

Calculate the number of protons, neutrons, and electrons in ¹⁴C atom.

Define isotopes and give an example.

Describe how isotopes are used in environmental science.

Describe one application of isobars in science or technology.

Explain why isobars have different chemical properties.

Explain why isotopes of the same element have nearly identical chemical properties.

Explain why the atomic masses of elements are not whole numbers.

Give an example of a pair of isobars and explain your choice.

If an atom has 20 protons and 20 neutrons, what is its mass number?

If two atoms have the same number of neutrons but different numbers of protons, are they isotopes, isobars, or neither?

Isotopes of chlorine are ³⁵Cl and ³⁷Cl. What is the difference in the number of neutrons between them?

State one difference between isotopes and isobars.

State one use of isotopes in medicine.

The atomic number of chlorine is 17. How many neutrons are present in ³⁷Cl?

The atomic number of sodium is 11. How many protons and neutrons are present in ²³Na?