State two ways in which Mendeleev's periodic table of the elements differs from that of Moseley. - Leaving Cert Chemistry - Question 1(f) - 2003
Question 1(f)
State two ways in which Mendeleev's periodic table of the elements differs from that of Moseley.
Worked Solution & Example Answer:State two ways in which Mendeleev's periodic table of the elements differs from that of Moseley. - Leaving Cert Chemistry - Question 1(f) - 2003
Step 1
Mendeleev's periodic table is arranged by order of atomic mass
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Answer
In Mendeleev's periodic table, elements are arranged in order of increasing atomic mass, whereas Moseley's periodic table is arranged according to atomic number.
Step 2
Gaps and the presence of man-made elements
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Answer
Mendeleev's table contains gaps for undiscovered elements, while Moseley's table has no gaps as all known elements are accounted for, including synthetic (man-made) elements.
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