From smallest to largest put these in order of their atomic radius Mg, Ba,
Sr, Ca
O Ca, Mg, Ba, S
O Ra, Sr, Ca, Mg
Mg, Ca, Sr, Ra
Mg, Sr, Ra, Ca
![From smallest to largest put these in order of their atomic radius Mg Ba Sr Ca O Ca Mg Ba S O Ra Sr Ca Mg Mg Ca Sr Ra Mg Sr Ra Ca class=](https://us-static.z-dn.net/files/df0/a5bfcc9013a1a0f04b38077b3efd8442.png)