Answer the following question given this paragraph: The elements of the halogen group (Group 17) gain electrons most readily, as can be seen from their large negative electron affinities. This means that more energy is released in the formation of a halide ion than for the anions of any other elements. Considering electron configuration, it is easy to see why. The outer configuration of all halogens is n s 2 n p 5 . The addition of one more electron gives the halide ions the same electron configuration as a noble gas, which we have seen is particularly stable. Q: The addition of electron gives the halide ions the same electron configuration as what gas? A:

OPTIONS:
- a flammable gas
- a fatty gas
- an inert gas
- a noble gas

Answer: a noble gas

Answer the following question given this paragraph: A unique feature of echinoderms is their water vascular system. This is a network of canals that extends along each body part. In most echinoderms, the canals have external projections called tube feet (see Figure below ). The feet have suckers on the ends. Muscle contractions force water into the feet, causing them to extend outward. As the feet extend, they attach their suckers to new locations, farther away from their previous points of attachment. This results in a slow but powerful form of movement. The suckers are very strong. They can even be used to pry open the shells of prey. Q: What is considered to be a unique feature of echinoderms? A:

OPTIONS:
- oil vascular system
- air vascular system
- iron vascular system
- water vascular system

Answer: water vascular system

Answer the following question given this paragraph: When using the lens makers equation, remember that real things get positive numbers and virtual things get negative numbers. Thus, diverging lenses and virtual images get negative numbers. The object distance is always positive. Q: In the lens makers' equation, diverging lenses and virtual images are associated with what kinds of numbers? A:

OPTIONS:
- positive numbers
- variable numbers
- fractional numbers
- negative numbers

Answer: negative numbers

Answer the following question given this paragraph: Q: The fossil record indicates that anthropoids began diverging from other primates about how many million years ago? A:

OPTIONS:
- 70
- 40
- 60
- 50

Answer:
50