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H2 is a/an

The electron configuration for an atom is 1s2 2s2 2p3.  The atomic number of the element is

CH2 is an example of what type of formula?

Given the following information, calculate the weighted average atomic mass of xx. Isotope % Abundance Atomic Mass X-63 69.092% 62.930amu X-65 30.91% 64.928amu

For 5 bonus points, if the wavelength of a certain color of light is 724nm, what is the corresponding frequency?

The electron configuration for aluminum (atomic number 14) is

How many atoms are there in 1 mol of sodium?

Neutrons and electrons have roughly the same mass.

Given the following information, calculate the weighted average atomic mass of xx. Isotope   % Abundance Atomic Mass X-63   59.092% 62.930amu X-65   40.91% 64.928amu

Magnesium oxide is molecular.