Worksheet: Isotopes

In this worksheet, we will practice defining and identifying isotopes of an element and representing differences in structure using nuclide symbols.

Q1:

Rusting can be detected by immersing an iron object in an aqueous solution of ferroxyl indicator.

What color is a fresh aqueous ferroxyl indicator?

  • AColorless
  • BGreen
  • CRed
  • DYellow
  • EBlue

What color is observed in an aqueous ferroxyl indicator solution if F e 2 + ions are present?

  • ABlue
  • BGreen
  • CPurple
  • DRed
  • EYellow

Which species is present if a pink color is observed in an aqueous ferroxyl indicator solution?

  • A H 2
  • B H O 3 +
  • C O H
  • D O 2
  • E F e 3 +

Q2:

Nuclide notation is used to summarize some of the properties of an atom or an ion. Which of the following properties is not directly expressed in nuclide notation?

  • AAtomic number
  • BMass number
  • CElement symbol
  • DNeutron number
  • ECharge

Q3:

The isotope hydrogen-1 has the nuclide symbol 1 1 H .

How many protons are there in atoms of hydrogen-1?

How many neutrons are there in atoms of hydrogen-1?

What is the mass number of hydrogen-1?

Q4:

The isotope oxygen-18 has the nuclide symbol 1 8 8 O .

How many protons are there in atoms of oxygen-18?

How many neutrons are there in atoms of oxygen-18?

What is the mass number of oxygen-18?

Q5:

In nuclide notation, which position is occupied by the mass number?

  • A X
  • B X
  • C X
  • D X

Q6:

In nuclide notation, which position is occupied by the atomic number?

  • A X
  • B X
  • C X
  • D X

Q7:

Which of the following nuclides has the greatest number of neutrons?

  • A 3 2 S
  • B 3 0 S i
  • C 4 0 C a
  • D 3 9 C l
  • E 3 9 K

Q8:

The isotope iridium-193 has the nuclide symbol 1 9 3 7 7 I r .

How many protons are there in atoms of iridium-193?

How many neutrons are there in atoms of iridium-193?

What is the mass number of iridium-193?

Q9:

Which of the following nuclides has the lowest number of neutrons?

  • A 1 1 B e
  • B 1 1 B
  • C 1 2 C
  • D 1 2 N
  • E 2 1 F

Q10:

What is the nuclide symbol for the isotope of oxygen with the same number of neutrons and protons?

  • A 8 8 O
  • B 8 1 6 O
  • C O 1 6 8
  • D 1 6 8 O
  • E O 8 1 6

Q11:

What is the nuclide symbol for the isotope of carbon with two more neutrons per nucleus than carbon-12?

  • A 6 1 2 C
  • B 6 1 4 C
  • C 1 2 6 C
  • D 1 4 6 C
  • E 1 2 8 C

Q12:

What is the nuclide symbol for carbon-12?

  • A 6 6 C
  • B 6 1 2 C
  • C C 6 1 2
  • D 1 2 6 C
  • E C 1 2 6

Q13:

What is the nuclide symbol for tritium, a hydrogen isotope with two neutrons?

  • A 1 3 H
  • B 3 1 T
  • C 1 3 T
  • D 3 1 H
  • E H 3 1

Q14:

What is the nuclide symbol for oxygen-16?

  • A 8 8 O
  • B 8 1 6 O
  • C O 1 6 8
  • D 1 6 8 O
  • E O 8 1 6

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