A sample of iodine is easiest to ship as a powder because it is , making it easy to break into small pieces.

Helium is less
than the elements that make up the air we breathe, so a balloon filled with helium will float in air.

Plastic is a compound of nonmetallic elements, so its
properties make it a popular coating for electric wires to prevent the current from escaping.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

може ли да зареждате повече информация, моля

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

hope this mark me brainliest