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5 votes
1. Moving from 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

1 Answer

3 votes
d. mass number is the anwer or it could also be atomic number i think it is actually b
answered
User Pradeep Pati
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