Worksheet: Isotopes

In this worksheet, we will practice defining and identifying isotopes of an element, listing some of their properties and uses, and calculating the relative atomic mass of an element from isotopic abundances.

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?

  • ARed
  • BBlue
  • CGreen
  • DColorless
  • EYellow

What color is observed in an aqueous ferroxyl indicator solution if Fe2+ ions are present?

  • APurple
  • BRed
  • CGreen
  • DBlue
  • EYellow

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

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

  • ACharge
  • BMass number
  • CAtomic number
  • DElement symbol
  • ENeutron number

Q3:

The isotope hydrogen-1 has the nuclide symbol 11H.

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 188O.

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

Q8:

The isotope iridium-193 has the nuclide symbol 19377Ir.

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

Q10:

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

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

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

Q12:

What is the nuclide symbol for carbon-12?

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

Q13:

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

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

Q14:

What is the nuclide symbol for oxygen-16?

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

Q15:

The “iso” in “isotope” is derived from the Greek word for “equal”. In what way are isotopes equal?

  • AThey have the same number of protons in their nuclei.
  • BThey have the same atomic radius.
  • CThey have the same mass number.
  • DThey have the same number of neutrons in their nuclei.
  • ETheir common ions have the same charge.

Q16:

Fill in the blank. Isotopes are atoms with the same number of protons but a different number of .

  • Aions
  • Bnuclei
  • Catoms
  • Dneutrons
  • Eelectrons

Q17:

An atom has 3 protons and 5 neutrons in its nucleus. Which of the following is an isotope of this atom?

  • AAn atom with 3 protons and 5 neutrons in its nucleus
  • BAn atom with no protons and 5 neutrons in its nucleus
  • CAn atom with 4 protons and 4 neutrons in its nucleus
  • DAn atom with 3 protons and 4 neutrons in its nucleus
  • EAn atom with 5 protons and 3 neutrons in its nucleus

Q18:

Which of the following is an isotope of magnesium-25?

  • AMagnesium-24
  • BMagnesium-25
  • CSodium-25
  • DTitanium-50
  • ESodium-23

Q19:

Which of the following isotopes is the heaviest?

  • ANeon-22
  • BBoron-11
  • CHydrogen-3
  • DSodium-21
  • EFluorine-17

Q20:

What does it mean if two atoms are described as isotopes?

  • AThey are different elements with the same atomic mass.
  • BThey have the same number of neutrons but different numbers of protons in their nuclei.
  • CThey have the same number of protons but different numbers of neutrons in their nuclei.
  • DThey are equally unstable.
  • EThey are chemically bonded together.

Q21:

Which of the following isotopes is the heaviest?

  • A 4 0 1 8 A r
  • B 4 4 1 8 A r
  • C 3 9 1 9 K
  • D 4 0 2 0 C a
  • E 4 1 1 9 K

Q22:

Which of the following isotopes is the heaviest?

  • ACarbon-12
  • BOxygen-16
  • CNitrogen-15
  • DBoron-11
  • EFluorine-15

Q23:

Which of the following is an isotope of carbon-12?

  • ABoron-11
  • BCarbon-14
  • CNitrogen-15
  • DOxygen-12
  • EOxygen-16

Q24:

An atom has 2 protons and 2 neutrons in its nucleus. Which of the following is an isotope of this atom?

  • AAn atom with no protons and 2 neutrons in its nucleus
  • BAn atom with 2 protons and 3 neutrons in its nucleus
  • CAn atom with 1 proton and 2 neutrons in its nucleus
  • DAn atom with 2 protons and 2 neutrons in its nucleus
  • EAn atom with 1 proton and 3 neutrons in its nucleus

Q25:

Which of the following is an isotope of 32S?

  • ASilicon-32
  • BScandium-30
  • CSulfur-30
  • DSilicon-30
  • ESulfur-32

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