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

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Question 39
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This question is about atoms and isotopes.

a.

An atom of element Y has:

  • an atomic number of 16
  • a mass number of 35

Give the number of electrons and the number of neutrons in this atom of element Y. Choose answers from: 16, 19, 35, 51.

[2]
b.

Table 1 shows information about two isotopes of element Z.

Table 1

IsotopeMass numberPercentage abundance (%)
Isotope A6960.1
Isotope B7139.9

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

Use Table 1 and the equation: Ar=(mass number×percentage) of isotope A+(mass number×percentage) of isotope B100A_r = \frac{(\text{mass number} \times \text{percentage}) \text{ of isotope A} + (\text{mass number} \times \text{percentage}) \text{ of isotope B}}{100}Ar​=100(mass number×percentage) of isotope A+(mass number×percentage) of isotope B​

Give your answer to 3 significant figures.

[3]
c.

Suggest the identity of element Z. Use the periodic table.

[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