On the periodic table, which group contains the noble gases?       the last group    a. the second group    b. the fourth group    c. the first group    d. same number of protons

In this reaction n2o4(g)→2no2(g) what changes in color would you expect as pressure is increased at a constant temperature

Nonmetal halogen family atmoic mass 35

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.