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28 November, 18:37

Moving left to right across a row of the periodic table, which of the following values increases by exactly one from element to element?

a. isotope number

b. atomic number

c. atomic mass unit

d. mass number

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  1. 29 November, 18:07
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    B. atomic number.

    moving from left to right across a period, atoms become smaller and smaller as the atomic number increases.
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