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julia-pushkina [17]
3 years ago
7

The periodic table below shows which elements are metals, nonmetals, and metalloids. the element with the chemical symbol ______

_ is a nonmetal.
a. al
b. na
c. h
d. k
Chemistry
1 answer:
aleksandr82 [10.1K]3 years ago
8 0
H.
represents hydrogen element. under non metal classification.

for others, you'll find them under metal element classification.
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A laser produces 17.0 mW of light. In 4.00 hr , the laser emits 6.04×1020 photons. What is the wavelength of the laser?
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The unit 'mW' means milliwatts. It is a unit of work. There are 1,000 milliwatts in a 1 Watt of work. In 4 hours, there are 14,400 seconds.

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λ = 4.9×10⁻⁷ m or 49 micrometers


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