How many valence electrons does bromine (Br, atomic no. = 35) have?
A. 28
B. 1
C. 35
D. 21
E. 7
Answer: E
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Beneath Earth's surface, where does the heat exchange occur that moves tectonic plates?
A) convection cells
B) continental crust
C) subducting plate
D) mid-ocean ridge
E) ocean trenches
The volume of water that a stream carries per unit of time is its discharge
Indicate whether the statement is true or false.
Why would astronomers have difficulty spotting a large incoming asteroid headed for Earth?
a. ?It remains in a fixed position in the sky as it comes in directly, so astronomers cannot see its trajectory. b. ?It comes in so fast that they do not have time to see it. c. ?It is dark before becoming heated in Earth’s atmosphere. d. ?It is not an important topic to monitor for most astronomers. e. ?It is simply too big to seem as if it is moving.
The land survey system that was based upon natural obstacles is known as the ________.
A. natural survey method B. rectangular survey system C. long lot system D. metes-and-bounds system