Which group of elements illustrates the shift from metallic to non-metallic character across a period of the Periodic Table?
- Aberyllium $\rightarrow$ magnesium $\rightarrow$ calcium
- Bfluorine $\rightarrow$ bromine $\rightarrow$ iodine
- Coxygen $\rightarrow$ boron $\rightarrow$ lithium
- Dsodium $\rightarrow$ silicon $\rightarrow$ chlorine