Chlorine is usually obtained as a mixture
of two isotopes which contain 18 and
20 neutrons respectively. the relative
atomic mass of chlorine is 35.5 and its
proton number is 17. what is the ratio of
the heavier to the lighter isotope?

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

Agas can holds 2.0 gal of gasoline. what is this quantity in cubic centimeters?

An atom's configuration based on its number of electrons ends at 3p4. another atom has seven more electrons. starting at 3p, what is the remaining configuration? 3p63d34s2 3p43d54s2 3p64s23d3 3p44s23d