The atoms of which elements are least likely to form chemical bonds? check all that apply.

-phosphorus (p)
-helium (he)
-sodium (na)
-carbon (c)
-oxygen (o)
-neon (ne)
-argon (ar)

An adult inhales about 6.0×10−4 m3 of fresh air during a breath. only 20% of fresh air is oxygen. assume the pressure in the lungs is 1.0×105 paand the air is at a temperature of 300 k. how many oxygen molecules are in each breath? a. 1.4x10^23 b. 2.9x10^21 c. 4.9x10^-4 d. 2.9 x10^25