Calculate the wavelength of light emitted by an electron in hydrogen as it moves from n = 6 to n = 3. (Given : Speed of light, c = 3.00 x 108 ms-!, Planck's constant,
h = 6.63 x 10-34 J. s, Rydberg's constant, Rh = 2.18 x 10-18 J)

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

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each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.