Chemistry, 30.08.2019 15:20 savannnab1890

All of the elements in a family or group have similar chemical properties. which of the following statements best explains why this is true?
a. the elements in a group have the same number of protons in their nuclei.
b. the elements in a group have similar atomic mass numbers.
c. the elements in a group have the same number of valence electrons.
d. the elements in a group have similar atomic numbers

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