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IB Chemistry SL 1.2 The Nuclear Atom Questions

Practise IB Chemistry SL 1.2 by reading nuclear symbols, identifying isotopes, and calculating relative atomic mass from abundance data.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Use nuclear notation to find proton, neutron and electron counts, mass number and ionic charge.
  • Identify isotopes from nuclear notation and calculate relative atomic mass from isotope-abundance data.

Covered syllabus points

1.2.1—Atomic structure1.2.2—Isotopes

Question 1

[Maximum number: 3]

Titanium is a transition metal.

Question (a)

(a)

Titanium exists as several isotopes. The mass spectrum of a sample of titanium gave the following data:

Table for Question (a) — IB Chemistry SL

Calculate the relative atomic mass of titanium to two decimal places.

[ 2 ]

Question (b)

(b)

State the number of protons, neutrons and electrons in the 2248Ti{ }_{22}^{48} \mathrm{Ti} atom.

Protons:

Neutrons:

Electrons:

[ 1 ]

Question 2

[Maximum number: 5]

The element boron has two naturally occurring isotopes, 10 B{ }^{10} \mathrm{~B} and 11 B{ }^{11} \mathrm{~B}.

Question (a)

(a)

Define the term isotopes of an element.

[ 1 ]

Question (b)

(b)

Calculate the percentage abundance of each isotope, given that the relative atomic mass of B is 10.81 .

[ 2 ]

Question (c)

(c)

The percentage abundance of the isotopes of boron can be determined with a mass spectrometer. The diagram shows the operation of a mass spectrometer.

Figure for Question (c) — IB Chemistry SL
[ 2 ]

Question (i)

(i)

Deduce the number of protons, neutrons and the electron arrangement of the main ion of 11 B{ }^{11} \mathrm{~B} formed in stage Q.

Protons:

Neutrons:

Electron arrangement:

[ 2 ]
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