There were 270*100/30 = 900 total finishers. 90% completed the marathon, so 900*100/90 = 1000 began the marathon. 1,000 runners total.
Krypton (Kr) and bromine (Br) are Period 4 elements that are also called p-block elements. Krypton is a noble gas while bromine is a halogen.
While comparing the stability of the two elements, Krypton is more stable than bromine. This is because being a noble gas, Krypton follows the octet rule and maintains its stability. Bromine has 35 electrons and the outer most valence shell has 7 electrons so its unstable. Krypton has 36 electrons and 8 electrons in the valence shell so its stable.
Copper pans are the most energy-efficient cookware, but they cost the most.
The answer is 2.25 hours, or 2 hours and 25 minutes.
9.50-5=4.50
4.50/2=2.25
