Answer:
AB
Explanation:
When combining two elements in different groups, you would just put them together unless you have two or more of each element
multiply the number of each atom with its molecular mass. (see the periodic table)
5*12 + 12*1 = 72 gram per mole.
Or more accurately: 5*12.01078 + 12*1.007947 = 72.149264 g/mole
Covalent compounds are compounds that share electrons. They tend to have properties like lower melting points and lower conductivity.
