IB Chemistry HL 1.2 The Nuclear Atom Question Bank

Practise IB Chemistry HL 1.2 with evidence-led questions on atomic structure, isotopes, nuclei and mass spectrometry.

Exam points

HL syllabus objectives and definitions
HL extended quantitative relationships and units

Covered syllabus points

1.2.1—Atomic structure 1.2.2—Isotopes 1.2.3 (HL)—Mass spectrometry

[Maximum number: 3]

Titanium and vanadium are consecutive elements in the first transition metal series.

(a)

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

Table for Question (a) — IB Chemistry HL

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

[ 2 ]

$\frac{(46\times7.98)+(47\times7.32)+(48\times73.99)+(49\times5.46)+(50\times5.25)}{100} =47.93$

Answer must have two decimal places with a value from 47.90 to 48.00.
Award [2] for the correct final answer.
Award [0] for 47.87, the Data Booklet value.

(b)

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

Protons:

Neutrons:

Electrons:

[ 1 ]

[Maximum number: 3]

Magnesium is a group 2 metal which exists as a number of isotopes and forms many compounds.

(a)

State the nuclear symbol notation, ${ }_{Z}^{A} X$ , for magnesium-26.

[ 1 ]

${ }_{12}^{26} \mathrm{Mg}$

(b)

Mass spectroscopic analysis of a sample of magnesium gave the following results:

Table for Question (b) — IB Chemistry HL

Calculate the relative atomic mass, $A_{\mathrm{r}}$ , of this sample of magnesium to two decimal places.

[ 2 ]

$A_r=\frac{24(78.60)+25(10.11)+26(11.29)}{100} =24.3269 =24.33$

Award [2] for the correct final answer. Do not accept the Data Booklet value 24.31.

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Covered syllabus points

1.2 The nuclear atom question 1

Question (a)

Question (b)

1.2 The nuclear atom question 2

Question (a)

Question (b)