6. naturally occurring strontium consists of four isotopes, sr-84, sr-86, sr-87 and sr-88,
whose atomic masses are 83.9134, 85.9094, 86.9089 and 87.9056 amu respectively. the
most abundant isotope is sr-88 which accounts for 82.58% of naturally occurring
strontium and the least abundant isotope is sr-84 which accounts for 0.56% of naturally
occurring strontium. given that the observed atomic mass of strontium is 87.62 amu,
calculate the percentages of sr-86 and sr-87 in nature.

Non renewable resources like petroleum eventually

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

In water, a strong acid will break down into its component parts. a. completely b. partly c. never in water, a weak base will break down into its component parts. a. completely b. partly c. never