period 6 and 7
Period 2, It only contains two metals, making it the least metallic period
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Apart from Hydrogen, Helium and Beryllium; non metals are located in the p-block. Starting from the third period with addition of Li, all of s-block elements are metals. The d-block elements are a compete set of metals.
The fifth period transition element with the greatest atomic number is tantalum (element 73).
The year 1778 saw the greatest number of sunspots during the period from 1700 to 1800.
Radium (atomic no. 88): Group 2 (Alkaline Earth Metals), period 7 of the periodic table of elements.
This element is the noble gas xenon (Xe) with 54 protons.
The element within period 2 with the greatest nuclear charge is neon. This is because neon has more protons in its nucleus compared to the other elements in period 2, giving it the highest nuclear charge.
12
ns1, where n is the number of the period in which the element is present
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The most reactive metals are the alkali metals in group 1a.