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very similar fossils have been found in rock masses that are separated by oceans and thousands of miles. for example, the fossil
remains of the same freshwater reptile species have been found in southern africa and southern south america. how can these
fossils exist so far away from each other?
a.
identical reptile species evolved separately on the two different land masses.
b. this species of reptile swam thousands of miles in search of a new habitat.
c. at some point, the land masses were connected to each other.
d. the land was once completely covered in fresh water.
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Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant. 

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So the main goal for the elements is stability which is a complete/full valence shell and typically the magic number for a stable element is 8 valence electron but not always. so elements to the left of the periodic table tend to be way less stable then those on the right, so the elements on the left are much more reactive.