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Which of the following correctly describes a trend in atomic structure as you go down the elements in one group of the periodic table?

a: The atomic mass and the atomic number increase as you go down in the group.
b:The atomic mass increases and the atomic number stays constant as you go down in the group
c:The atomic mass stays constant and the atomic number increases as you go down in the group.
d:The atomic mass and the atomic number increase by 1 as you go down in the group.

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chrisxxz
a is the correct answer

groups are the vertical columns on the table. if you look at it, you can see that the atomic number and atomic mass increases as you go down.
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