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The meaning is that chemical properties are periodically repeated in the table.
Astatine is placed in group-17 in the Periodic Table. Its symbol is At.
Fermium (Fm) is in Group 7 in the Periodic Table.
Yttrium is in group 3 on the periodic table, also known as the scandium group.
Indium is in group 13 of the periodic table, also known as the boron group.