No.
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Carbon and chlorine are not numbers, so that kind of comparison is inappropriate.
Yes.
A planet with a greater mass does not necessarily have greater surface area than one with less mass. The planet could be made of denser material and have a smaller surface area. Mass doesn't always mean volume.
The mass of feathers is far greater than the lead. amount = mass So you will have a huge pile of feathers compared to a small chunk of lead to equal a pound
Element 34, Selenium, has an atomic mass of about 78.96.