A(n) is an atom or a group of atoms with either a positive or negative charge O compound
O ion
O molecule
O nucleus

What is the temperature of one mole of helium gas at stp?

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.

Astudent is asked to identify and element that is pale yellow brittle solid and does not conduct electricity. at which location in this periodic table would the element most likely be found?