drag item into the proper states of matter category 2nd task

How will the emission of an alpha particle affect the atomic number of an atom

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?