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crossword elements

Across
The heaviest of the stable halogens
Its chemically similar to selenium and tellurium
It is an extremely radioactive element and its atomic number is 109
Element discovered in 1817 by Jöns Jacob Berzelius
It is the sixth element in group 2 of the periodic table
Element used since ancient times for jewelry and paints
Is not found free in nature its atomic number is 81 It was isolated by both Lamy and Crookes in 1862
Down
The element is in group 7 its atomic mass is 262
The element is a member of group 18 (noble gases) elements
The element is in group 13 of the periodic table, it is a metal
The element is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table
The element on the periotic table with atomic number 73
The element was Discovered in 1940
The element is named after the American nuclear chemist Glenn T. Seaborg
The element was long considered the element with the highest atomic mass that is stable
This soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury