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Worksheet: Properties of Stable Nuclei

Q1:

A nuclide is particularly stable if the number of protons or neutrons is equal to one of the magic numbers: 2, 8, 20, 28, 50, 82 and 126. A double magic nuclide is one in which the numbers of protons and neutrons are both magic.

Which of the following nuclides is double magic?

  • A 7 6 N i
  • B 2 1 0 P b
  • C 1 8 O
  • D 4 8 C a
  • E 1 3 0 S n

What is the difference between the mass numbers of the two most likely double magic isotopes of tin?

Q2:

Which of the following is a stable nuclide?

  • ANeon-42
  • BBarium-83
  • CIron-40
  • DAluminium-27
  • ELithium-12

Q3:

Using the Periodic Table, identify which of the following is the most stable isotope.

  • A 7 3 3 6 K r
  • B 7 4 3 6 K r
  • C 8 6 3 6 K r
  • D 8 4 3 6 K r
  • E 8 1 3 6 K r

Q4:

Which of the following nuclides has an even number of neutrons?

  • A 1 0 3 P d
  • B 1 0 8 A g
  • C 1 0 2 R h
  • D 1 1 0 C d
  • E 1 0 3 R u

Q5:

Which of the following statements is true?

  • AMost stable isotopes contain an even number of protons and an odd number of neutrons.
  • BMost stable isotopes contain an odd number of nucleons: isotopes with an even atomic number usually contain an odd number of neutrons, and vice versa.
  • CMost stable isotopes contain an odd number of protons and an odd number of neutrons.
  • DMost stable isotopes contain an even number of protons and an even number of neutrons.
  • EMost stable isotopes contain an even number of nucleons, but there are similar numbers of stable isotopes with odd and even atomic numbers.

Q6:

Which of the following is a stable nuclide?

  • A 2 4 1 4 S i
  • B 2 0 6 C
  • C 8 5 3 2 G e
  • D 1 1 8 5 0 S n
  • E 1 4 2 8 2 P b

Q7:

A nuclide is particularly stable if the number of protons or neutrons is equal to one of the magic numbers: 2, 8, 20, 28, 50, 82 and 126. These nuclides are termed magic.

Which of the following nuclides is not magic?

  • A 5 2 C r
  • B 8 2 N i
  • C 2 0 O
  • D 5 0 V
  • E 3 9 K

How many elements in period 4 of the Periodic Table have a magic number of protons?

There is one naturally occurring magic isotope of bismuth. What is the mass number of this isotope?

Q8:

A nuclide contains 𝑍 protons and 𝑁 neutrons. Which of the following expressions is true for most stable nuclides?

  • A 𝑁 > 2 𝑍
  • B 𝑁 = 𝑍
  • C 2 𝑁 > 𝑍 > 𝑁
  • D 2 𝑍 > 𝑁 > 𝑍
  • E 𝑍 > 2 𝑁