Group 18 noble gases are inert because

a. they readily form positive ions.

b. they can have either a positive or a negative charge.

c. their outermost energy level is missing one electron.

d. their outermost energy level is full.

An x-ray beam with wavelength 0.240 nm is directed at a crystal. as the angle of incidence increases, you observe the first strong interference maximum at an angle 24.5 ∘. what is the spacing d between the planes of the crystal?

Pedestrians, bicyclists and slow-moving vehicles are not allowed on expressways because expressways have minimum speed limit requirements that these travelers cannot reach. A. True B. False

Which season is occurring in earths northern hemisphere when earths Southern Hemisphere is tilted toward the sun

Does time effect the work done?

The end of which era left many plants, insects, and salamander-like animals on the Earth? a. the Precambrian time c. the Paleozoic era b. the Mesozoic era d. the Cenozoic era

Whay is moon non-lominous body

How many (whole number of) 91 kg people can safely occupy an elevator that can hold a maximum mass of exactly 1 metric ton? A metric ton is 1.000 * 103 kg. Answer in units of people.

Cho is using technological design to build a clock based on the apparent motion of the Sun. Which of the following would be the best measure of success for Cho's clock? A. Cho's clock works even at night. B.

Suppose that a car traveling to the west (-x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration. a) The car is decelerating and its acceleration is positive.

What are the moons of the outer planets made of, and how is their composition different from that of our Moon?