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 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.
A scientist finds two atoms: Atom X has 17 protons and 20 neutrons, Atom Y has 18 protons and 19 neutrons. Are they isobars?
Which isotope of carbon is radioactive and used in radiocarbon dating? (1) 12C (2) 13C (3) 14C (4) 15C
Which isotope of hydrogen is radioactive? (1) Protium (2) Deuterium (3) Tritium (4) None of these
Which of the following is a correct statement about isotopes? (1) They have different atomic numbers (2) They have different numbers of electrons (3) They have the same number of protons (4) They have different chemical properties
Which of the following is a pair of isobars? (1) 12C and 14C (2) 40Ar and 40K (3) 35Cl and 37Cl (4) 1H and 2H
Fill in the blank: The isotope 235U is used as a fuel in ________ reactors.
Fill in the blank: The isotopes of hydrogen are ________, ________, and ________.
Fill in the blank: The sum of protons and neutrons in an atom is called the ________ number.
Isobars are atoms that have the same ________ but different ________.
State whether the following statement is true or false: Isobars have the same number of protons.
True or False: Isobars always belong to different elements.
True or False: Isotopes can be separated by physical methods such as diffusion or centrifugation.
True or False: Isotopes can have different physical properties such as density and melting point.
