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Which element does not have the same number of

electrons in its outermost shell as the other elements in its
group? (1 point)
hydrogen (H)
boron (B)
helium (He)
bromine (Br)

1 answer

In the periodic table, elements are grouped by similar properties, including the number of electrons in their outermost shell.

  • Hydrogen (H) has 1 electron in its outermost shell.
  • Boron (B) has 3 electrons in its outermost shell.
  • Helium (He) has 2 electrons in its outermost shell.
  • Bromine (Br) has 7 electrons in its outermost shell.

The element that does not have the same number of electrons in its outermost shell as the other elements in its group is hydrogen (H), as it is in Group 1 and has only 1 electron, while the other elements belong to different groups (boron to Group 13, helium to Group 18, and bromine to Group 17).