Block (periodic table)
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A block of the periodic table is a set of elements unified by the atomic orbitals their valence electrons or vacancies lie in. The term seems to have been first used by Charles Janet. Each block is na
Aluminium (metal), Z = 13
Silicon (metalloid), Z = 14
Phosphorus (nonmetal), Z = 15
Period 2 element
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A period 2 element is one of the chemical elements in the second row of the periodic table of the chemical elements. The periodic table is laid out in rows to illustrate recurring trends in the chemic
Lithium metal floating on paraffin oil
Large piece of beryllium
Boron chunks
Diamond and graphite, two different allotropes of carbon