An object's density is 15 g/cm^3 and its volume is 3 cm^3. What is its mass?
a. 45 g
b. 18 g
c. 12 g
d. 5 g

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

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.

Miner's coal distributors does not mine coal itself, nor does it even store or handle the coal. instead, miner's solicits orders for low sulfur coal from other firms, then purchases the required amount from suppliers and directs them to ship the coal to its customers. what is miner's