Of the elements Fe, Hg, U, Te, and Y, which is considered a Group A element?
Of the elements Pt, Sc, V, and Kr, which is a nonmetal?
What is each vertical column of elements in the periodic table called?
What criterion is used to arrange the elements in columns on the periodic table?
Who first arranged the elements according to atomic mass and noticed a periodic recurrence of their physical and chemical properties?
Who first arranged the elements according to nuclear charge?
From top to bottom in a group of elements, ionization energies tend to
From top to bottom in most groups of elements, atomic radii tend to
Not including the noble gases, which area of the periodic table has the highest electronegativities?
The electron affinity of an atom typically depends on the
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