Aradioactive sample has a half life of 1500 years. a sealed tube containing 1g of the sample will contain after 3000years.
(a) 1 g of the sample
(b) 0.5 g of the sample
(c) 0.25 g of the sample
(d) 0.00 g of the sample

100 points answer quick the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

What’s the percent by mass of carbon in c10h14n2

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '