The correct answer is: [D]: "S" (sulfur).
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<u>Note</u>: The other answer choices:
[A]: "K" (potassium) ;
[B]: "Na" (sodium) ;
[C] "Mg" (magnesium) ;
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are all metals.
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Answer choice: [D]: "S" (sulfur) ; is NOT a metal; and may exist in gaseous form.
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The answer I believe is moist air because it doesn't have a reacting bond in the molecules
It's very simple.
Energy =

where, h= Planck's constant = 6.6 x

c= speed of light = 3 x

m/s

= wavelength
So, energy =

= 1.65 x

J
=1.65 x

KJ
Answer:
a) 52.8
Explanation:
M1V1 = M2V2
(7.91 M)(x ml) = (2.13 M)
(196.1 ml)
(7.91M) (xml) = 417.693 M.ml
x ml = 417.693/ 7.91
x = 52.8