Qual é a distribuição eletrônica, em subníveis, para o cátion Ca2+ (Dado: n atômico do cálcio=20.) a)1s2 2s5 2p6 3s2 3p6 4s2 b)1s2 2s2 3s2 3p6 3d2 c)1s2 2s2 2p6 3s2 3p6 d)1s2 2s2 2p6 3s2 3p6 4s2 3d2 e)1s2 2s2 3s2 3p4 4s2

In a floral arrangement, the focal area is often

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

Which type of bonding involves the complete transfer of a valence electron from a less electrogrative atom to a more electronegative one