3.2. Relative masses of atoms and molecules
A subsection of Chemistry, 0620, through 3. Stoichiometry
Listing 10 of 79 questions
The symbols of the elements in Period3 of the Periodic Table are shown. Na Mg Al Si P S Cl Ar Use the symbols of the elements in Period3 to answer the questions that follow. Each symbol may be used once, more than once, or not at all. Give the symbol of the element that: is present in purified bauxite ����������������������������������������������������������������������������������������� contains atoms with a full outer shell of electrons �������������������������������������������������������� is used to kill microbes in water treatment �������������������������������������������������������������������� forms an amphoteric oxide ������������������������������������������������������������������������������������������� forms an oxide which causes acid rain ������������������������������������������������������������������������� has an oxidation number of –1 when it forms a compound with hydrogen. The relative atomic masses of elements can be calculated from the relative masses of isotopes and their percentage abundances. Identify the isotope to which all relative masses are compared. Table2.1 shows the relative masses and the percentage abundances of the two isotopes in a sample of magnesium. Table 2.1 relative mass of isotope percentage abundance of isotope Calculate the relative atomic mass of magnesium to one decimal place.  relative atomic mass = An ion contains 10 electrons, 13 protons and 14 neutrons. State the nucleon number of the ion. Identify the element that forms this ion. 
0620_s23_qp_43
THEORY
2023
Paper 4, Variant 3
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79