Magnesium has three isotopes.
i)
State the meaning of the term isotopes.
(2)
ii)
The symbol for an atom of one isotope of magnesium is
Give the number of protons, neutrons and electrons in one atom of this isotope.
(2)
number of protons ..............................
number of neutrons ..............................
number of electrons ..............................
iii)
A sample of magnesium contains these percentages of the three isotopes.
Mg‐24 = 79.00% Mg‐25 = 10.00% Mg‐26 = 11.00%
Use this information to show that the relative atomic mass of magnesium is 24.32
(2)
iv)
One mole of magnesium has a mass of 24.32 g.
There are 6.022 × 1023 atoms in one mole.
Calculate the mass, in grams, of one atom of magnesium.
Give your answer to 4 significant figures.
(2)
mass = .............................................................. g