The atomic number of the atom which does not usually form compounds is: 16 17 18 19 20

Scientists discover two new elements, element A and element X, and are able to determine their atomic mass. Element A has an atomic mass of 17 amu Element X has an atomic mass of 76 amu.

What is the formula for tons to meters

At 27.00 °c a gas has a volume of 6.00 L. What will the volume be at 150.0 °c

which statement is true of phenolphthalien? a. it can be used in combustion reactions. b. it is colorless in the presence of an acid and pink in the presence of a base. c. it gives you the exact pH of a solution. d.

Pure water has a hydrogen ion concentration of 1 * 10-7 M and a pH of 7. A student measures a basic solution and finds that it has a hydrogen ion (H+) concentration of 1 * 10-3. Explain why the student must have made an error in her measurement.

How many hydrogen bonds can CH3-O-CH2OH form with water?

What is a substance that has mass and volume

Why does some friction occur with seemingly smooth surfaces?

What is nano in the 10th power

What is the mass in grams of a sample of 1.20 x 10 22 atoms of mercury?