Why are the noble gases such as helium (He) and neon (Ne) grouped together in the periodic table?
A- They are nonreactive gases.
B-They are highly reactive metallic solids.
C-They are dangerous gases when combined with water.
D-They are liquid at room temperature and have high boiling points.

What are the 4 phases of matter in order of increasing engery content?

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

The vapor pressure of water at 25.0°c is 23.8 torr. determine the mass of glucose (molar mass = 180 g/mol) needed to add to 500.0 g of water to change the vapor pressure to 22.8 torr.