Draw the structure of (1e,4r)-1,4-dimethylcyclodecene. higher priority groups the e isomer has two higher priority groups on opposite sides. the z isomer has two on the same side when placing the lowest priority group away from you, the r isomer will have the remaing groups in clockwise order (1e,4r)-1,4-dimethylcyclodecene will have 10 carbon atoms in its parent chain chs groups are located on carbon atoms 1,4.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

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