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Worksheet: Isotopes

Q1:

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

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

Q2:

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

  • Aatoms
  • Belectrons
  • Cnuclei
  • Dneutrons
  • Eions

Q3:

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

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

Q4:

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

  • ASodium-23
  • BSodium-25
  • CMagnesium-25
  • DMagnesium-24
  • ETitanium-50

Q5:

Which of the following isotopes is the heaviest?

  • AFluorine-17
  • BSodium-21
  • CHydrogen-3
  • DNeon-22
  • EBoron-11

Q6:

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

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

Q7:

Which of the following isotopes is the heaviest?

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

Q8:

Which of the following isotopes is the heaviest?

  • AFluorine-15
  • BCarbon-12
  • CBoron-11
  • DOxygen-16
  • ENitrogen-15

Q9:

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

  • ANitrogen-15
  • BOxygen-12
  • CBoron-11
  • DCarbon-14
  • EOxygen-16

Q10:

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

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

Q11:

Which of the following is an isotope of 3 2 S ?

  • ASilicon-32
  • BSulfur-32
  • CSilicon-30
  • DSulfur-30
  • EScandium-30

Q12:

An atom has 1 proton and 2 neutrons in its nucleus. Which of the following is an isotope of this atom?

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