30. Explain why knowing both the period and group trend for atomic radius before the "It's In the Cards Activity would have helped you put the cards of the periodic table puzzle into correct order much more quickly

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.