The periodic table

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Question 20

In his 1869 periodic table, Mendeleev placed tellurium before iodine, despite tellurium having a higher relative atomic mass ( $127.6$ ) than iodine ( $126.9$ ).

Identify the fundamental property of atoms that determines their order in the modern periodic table, resolving this atomic mass anomaly.

[1]

The periodic table

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

Question 20

In his 1869 periodic table, Mendeleev placed tellurium before iodine, despite tellurium having a higher relative atomic mass ( $127.6$ ) than iodine ( $126.9$ ).

Identify the fundamental property of atoms that determines their order in the modern periodic table, resolving this atomic mass anomaly.

[1]

The periodic table

Question 20

The periodic table Questions

The periodic table

Question 20

The periodic table Questions