(a) Define (i) atomic number, (ii) relative atomic mass.
Worked Solution & Example Answer:(a) Define (i) atomic number, (ii) relative atomic mass. - Leaving Cert Chemistry - Question 5 - 2011
Step 1
(i) atomic number
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Answer
The atomic number of an element is defined as the number of protons present in the nucleus of an atom of that element. This fundamental property determines the identity of the element and its position in the periodic table.
Step 2
(ii) relative atomic mass
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Answer
Relative atomic mass is the average mass of an atom of an element, taking into account the abundance of its isotopes. It is expressed relative to one twelfth ( rac{1}{12}) of the mass of a carbon-12 atom. This measurement allows for the comparison of the mass of different atoms on a relative scale.
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