Strontium, Sr (number 38), is especially dangerous to humans because it tends to accumulate in calcium-dependent bone marrow tissues (calcium, Ca, number 20)
This fact relates to the organization of the periodic table in that strontium and calcium are both
A) metals.
B) in group 2 of the periodic table.
C) made of relatively large atoms.
D) soluble in water.
Answer: B
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In 21,200 years from now, Thuban will once again be our north celestial pole
a. True b. False Indicate whether the statement is true or false
The density of the Sun is most similar to which object?
A) Halley's Comet's nucleus B) the Earth C) Mercury D) the Moon E) Jupiter
For water to have been stable on Mars in the past,
A) temperature must have been higher and the atmospheric pressure lower B) temperature must have been lower and the atmospheric pressure higher C) both the temperature and the atmospheric pressure must have been higher D) both the temperature and the atmospheric pressure must have been lower
A particle whose mass is 2 kg moves in the xy plane with a constant speed of 3 m/s along the direction 
. What is its angular momentum (in kg?m2/s) relative to the origin?
A.
B.
C.
D.
E.