Are these atoms isotopes of each other or different elements?
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This is not easy. For many of the chemical elements there are several known isotopes. Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus.

b. th3 n4zc4 pl4t3 15 c0nv3rg1ng w1th the s0uth 4m3ric4n pl4t3.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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