As you move down group one of the periodic table, what happens to the atomic radii? ( a. they increase, because of the higher number of occupied energy levels. ( b. they increase, because of the stronger attratction bewteen electrons and the nucleus. ( c. they decrease, because of the weaker effective nuclear charge. ( d. they decrease, because of the lower number of protons.

The allotropes of carbon include a variety of structures that include three-dimensional tetrahedral lattices, planes of hexagonal rings, cylindrical tubes of hexagonal rings, and spheres of five- and six-membered rings. similar shapes of network covalent atomic solids are possible with carbon nitride, boron, and pure silicon (e. g., silicene is a graphene-like allotrope of pure silicon). in contrast, silicates exist as either highly ordered or amorphous (more random) three-dimensional lattices. what could explain why there are there no naturally occurring sheets, stacked sheets, cylindrical tubes, or spheres of network covalent atomic solids composed of silicon and oxygen (sio2)? would pure silicate structures make good lubricants or good electrical conductors?