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Yes they are all the same models.
all elements in a period all have the same amount of shells example: all elements in period 1 has only 1 shell all elements in period 2 has 2 shells so the period number is the same as the number of shells in that period
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Not all of them have "shells," but all of them have exoskeletons, which are essentially the same thing.
All of the isotopes of an element have the same chemical properties because they all have the same number of protons and the same number of electrons in their valence shells.
No. All the alkaline earth metals have 2 valence electrons, meaning they have two electrons in the outermost shells. No two alkaline earth metals have the same number of electron shells. Beryllium is the only one with two shells.
It all depends on what the event is but usually about 19,000
They have the same number of occupied energy levelsthey all have the same amount of outer shells for the atom
No, not all iPhone cases are the same size. The various iPhone models come in different sizes, so it is not possible to have a standard case size for all the models.
True
No.
Elements in the same grope share the same amount of energy shells, and valence electrons.