Agroup of elements are highly inactive and are used by chemists because of their chemical stability. most are found in pure form. they never bond with other atoms because their outermost electron orbital is full. in which element family are these elements found? a) alkali metals b) alkaline earth metals c) halogens d) noble gases

One hazard of space travel is debris left by previous missions. there are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. calculate the force exerted by a 0.110 mg chip of paint that strikes a space shuttle window at a relative speed of 5.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10-8 s. such a collision chipped the window of the ill-fated challenger in june 1983, causing $50,000 of damage.