I believe the correct answer from the choices listed above is the third option. The noble-gas notation for lead (Pb) would be [Xe]6s^2 4f^14 5d^10 6p^2. The standard electron configuration of lead is 1<span>s^2 </span>2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^<span>14 5</span>d^10 6p^2 simplifying will lead to the part having the same configuration as xenon to be written as [Xe].
Because you are missing information i'm going to give you meters converted into every sensible unit:
1.69 meters = 169 centimeters = 1690 millimeters = 0.169 kilometers
I would pick the first option in the third option
Ground based reflecting telescopes uses the radio wave part of the electromagnetic spectrum to view objects.
<h3>What is a Telescope?</h3>
This is an optical instrument which makes things or objects which are far to look nearer.
Ground based reflecting telescopes are used in outer space and blocks gamma , light waves etc but uses the radio waves.
Read more about Telescope here brainly.com/question/12818287
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