An unknown element x has the following isotopes: ²⁵x (80. 5% abundant) and ²⁷x (19. 5% abundant). What is the average atomic mass in amu of x?.

How did different parts of the united states feel about slavery

All of these sentences include commonly confused homophones. which sentence is correct? you put too much sugar on your breakfast serial. my father grows vegetables and flours in his garden. will someone me untie the knot in my shoelace? when did the captain set sale on his trip to north america?

An example of a fine motor skill is