Expressed in terms of "Atomic Mass Units, the electron's mass is
about 0.00054 . That is, it takes about 1,840 electrons to add up to
1 AMU of mass.
Choice-C on the list is not exactly true, but it's a lot closer than any
of the others.
Oml i literally answered this in class today XD it was C
Hi,
I've found a link that should assist you or answer your question.
http://click.dji.com/ANbvbbP7bwUWtSACp6U_?pm=link&as=0004
Have a nice day!
Pure substance has a definite and constant composition-like salt or sugar. A pure substance can be either an element or a compound, but the composition of a pure substance doesn’t vary.
Mixtures are physical combinations of pure substances that have no definite or constant composition — the composition of a mixture varies according to who prepares the mixture.