Exclusion Principle: Which one of the following is the correct electronic configuration for the sodium atom, which has 11 electrons?
A. 1s1 2s2 3p6 2s2
B. 1s2 2s1 3p6 2s2
C. 1s1 2s2 2p6 2s2
D. 1s2 2s2 2p6 3s2
E. 1s2 2s2 2p6 3s1
Answer: E
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Match the words in the left-hand column to the appropriate blanks in the sentences in the right-hand column. Use each word only once.
Saturn, Earth, Mars, Venus, Uranus, Mercury, Jupiter, Neptune
1. ____________ has a rotational axis that is tilted so much it lies nearly in the plane of its orbit.
2. ____________ is the planet with the highest average surface temperature.
3. The planet that orbits closest to the Sun is __________.
4. The only rocky planet to have more than one moon is ___________.
5. ___________ is the jovian planet that orbits closest to the Sun.
6. Most of the surface of _________ is covered with liquid water.
7. ___________ is about 30 times as far from the Sun as our own planet.
8. The planet with the lowest average density is ___________.
The Sun is a fairly normal star
Indicate whether the statement is true or false
Approximately what proportion of people in the United States believe we have been visited by extraterrestrials?
A) around 33% or a third B) about 50% or a half C) less than 1% D) more than 90%
A heavy seesaw is out of balance. A lightweight girl sits on the end that is tilted downward, and a heavy boy sits on the other side so that the seesaw now balances
If the boy and girl both move forward so that they are one-half their original distance from the pivot point, what will happen to the seesaw? A) The side the girl is sitting on will once again tilt downward. B) The side the boy is sitting on will now tilt downward. C) Nothing, the seesaw will still be balanced. D) It is impossible to say without knowing the masses of the children. E) It is impossible to say without knowing the values of the original distances.