Match the Numbers with the letters so the letters define the numbers 1. Atomic mass
2. groups
3. periods
4. atomic number
5. valence
6. negligible
7. electron shell

A. the outermost electrons of an atom, or those on residing in the outermost energy shell of an atom or ion

B. horizontal rows of the periodic table

C. vertical columns of the periodic table

D. a group of electrons at a similar energy level

E. extremely small and unimportant

F. generally the sum of the protons and neutrons

G. the number of protons in every atom of an element

If you burn 10 kilograms of wood in a fire (combustion) what is the weight of the products after the fire has finished burning the wood?

How many moles of bromine are needed to produce 3.23 moles of potassium bromide

Alice did an experiment to find the relationship between the angle at which a ray of light strikes a mirror and the angle at which the mirror reflects the light. she placed a ray box in front of a mirror. she changed the angle at which the light from the ray box struck the mirror and noted the corresponding angle at which the mirror reflected the light. which of the following is the dependent variable in this experiment? the mirror used to reflect the light the ray box used as the source of light angle at which the light from the ray box strikes the mirror angle at which the mirror reflects the light from the ray box