The isotope A has a half-life of 165 days. The isotope B has a half-life of 330 days. Which statement about these two isotopes is false? a) One year represents slightly more than two half-lives of a sample of the calcium isotope.

b) Almost all of 100 g of the calcium isotope will decay in one year's time.

c) 100 g of the vanadium isotope will decay to somewhat less than 50 g in a year.

d) The calcium isotope decays at twice the rate of the vanadium isotope.

e) All of these statements are true

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explanation:

crosscutting concepts have application across all domains of science. as such, they are a way of linking the different domains of science. they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

its first and third is your answer i did the qustion the fourth isnt right

the correct answer would be d. hope this !