A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

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Question 19
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This question is about atoms, isotopes, and relative atomic mass.

a.

An atom of element X has:

  • an atomic number of 14
  • a mass number of 30

Determine the number of electrons and the number of neutrons in this neutral atom of element X.

Select your answers from the following options: 14, 16, 30, 44.

[2]
b.

The table below shows the abundance of the two naturally occurring isotopes of element Y.

IsotopeMass numberPercentage abundance (%)
Isotope 17950.7
Isotope 28149.3

Calculate the relative atomic mass (ArA_rAr​) of element Y.

Use the data in the table and the equation:

Ar=(mass number×percentage) of isotope 1+(mass number×percentage) of isotope 2100 A_r = \frac{(\text{mass number} \times \text{percentage}) \text{ of isotope 1} + (\text{mass number} \times \text{percentage}) \text{ of isotope 2}}{100} Ar​=100(mass number×percentage) of isotope 1+(mass number×percentage) of isotope 2​

Give your answer to 3 significant figures.

[2]
c.

Using your answer to part (b) and a periodic table, suggest the identity of element Y.

[1]

A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes Questions

  1. GCSE
  2. /Chemistry
  3. /A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes