Which atom is most likely to form a metallic bond? aluminum (al) helium (he) phosphorus (p) carbon (c)

The answer is "aluminum (Al)".

A metallic bond is a sort of chemical bond that happens between particles of metallic components. It gives metals their one of a kind properties that are not found in nonmetal substances.  

In a strong metal the molecules are firmly stuffed together and the electrons in the most astounding involved vitality level of a particle cover with those of another iota. These electrons subsequently progress toward becoming delocalised. They are not related to one specific particle and they are allowed to travel through the structure. The metal iotas wind up positive particles. Subsequently metallic bonds are shaped as the emphatically charged metal particles are pulled in to the contrarily charged delocalised electrons.

the answer is the first A

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form