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kobusy [5.1K]
2 years ago
7

Each element has its own emission and absorption lines. What is the best explanation for this?

Physics
1 answer:
k0ka [10]2 years ago
3 0

D. Each element has unique energy levels.

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Answer: A.

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Can someone help on this I'm really stuck
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If an object is thrown in an upward direction from the top of a building 1.6 x 10^2 ft. high at an initial velocity of 21.82 mi/
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If an object is thrown in an upward direction from the top of a building 1.60 x 102 ft. high at an initial velocity of 21.82 mi/h, what is its final velocity when it hits the ground? (Disregard wind resistance. Round answer to nearest whole number and do not reflect negative direction in your answer.)


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7 0
3 years ago
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How many neutrons does element X have if its atomic number is 23 and its mass number is 90?
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Answer:

67

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Therefore, calling p the number of protons and n the number of neutrons, for element X we have:

Z = p = 23

A = p + n = 90

Substituting p=23 into the second equation, we find the number of neutrons:

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