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 10
Define isotopes.
Describe one difference between isotopes and isobars.
Describe one use of isotopes in scientific research.
Explain why isobars have different chemical properties.
A student writes: '14C and 14N are isobars.' Is this statement correct?
A scientist discovers two atoms: Atom X has 15 protons and 16 neutrons, Atom Y has 16 protons and 15 neutrons. Are these atoms isotopes, isobars, or neither? Justify your answer.
An element X has two naturally occurring isotopes: 29X (abundance 60%) and 30X (abundance 40%). Calculate the average atomic mass of element X.
Given the following data: 23Na (atomic number 11) and 23Mg (atomic number 12), determine whether these are isotopes, isobars, or neither. Explain your reasoning.
Which isotope of carbon is commonly used in radiocarbon dating? (1) 12C (2) 13C (3) 14C (4) 15C
Which isotope of hydrogen contains one proton and two neutrons? (1) Protium (2) Deuterium (3) Tritium (4) None of these
Which of the following is a pair of isotopes? (1) 12C and 12N (2) 16O and 18O (3) 40Ar and 40K (4) 35Cl and 35Ar
Which of the following is NOT a property that differs among isotopes of the same element? (1) Number of protons (2) Number of neutrons (3) Mass number (4) Atomic number
Fill in the blank: Isotopes of hydrogen are protium, deuterium, and ________.
Fill in the blank: The atomic number of 14N is ________.
Fill in the blank: The number of neutrons in 14C is ________. (Atomic number of carbon = 6)
If two atoms have the same mass number but different atomic numbers, they are called ________.
A student writes: '14C and 14N are isobars.' Is this statement correct?
State whether the following statement is true or false: Isotopes have different physical properties.
True or False: Isobars always belong to the same element.
True or False: Isobars have the same number of neutrons.
