1. Name the elements with the following symbols a. Na
b. H
c. C
d. O

2. What is the symbol for the following elements?

a. Helium
b. Sulfur
c. Copper
d. Lead

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

Which of the following shapes would represent a molecule with two bonded atoms and 3 lone pairs on only one of them , trigonal planar , bent , trigonal pyramidal , linear

Light waves are as they pass through the