If element R has 2 valence electron and element Q has 6 valence electrons, what is the likely compound that will form:

The answer for #3 is c but i don't know why

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

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.