Elements are more reactive as you go down the Periodic Table and to the left.
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Element number 113 (Nihonium) can be found in group 13 and period 6 of the modern periodic table. It is a synthetic element created in a laboratory and is highly reactive due to its configuration of valence electrons.
Element 117, Tennessine (Ts), is found in group 17 (formerly group 7) and period 7 of the periodic table.
The element with six electrons in its outer shell is oxygen.
The element filling a 3d sublevel in group 6 is Chromium (Cr), which has an electronic configuration of [Ar] 3d5 4s1.
The element found in group 14 period 2 is carbon. It has an atomic number of 6 and is a nonmetal.