2n2 so 2 x 92 = 162 (THEORECTICALLY)
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The ninth shell can hold a maximum of 162 electrons. This is determined by the formula 2n^2, where n represents the shell number. So for the ninth shell (n=9), the maximum number of electrons it can hold is 2(9)^2 = 162 electrons.
The first shell of an atom can hold a maximum of 2 electrons.
The K shell of an atom can hold a maximum of 2 electrons.
The first shell can hold up to 2 electrons, the second shell can hold up to 8 electrons, the third shell can hold up to 18 electrons, and the fourth shell can hold up to 32 electrons.
The third electron shell can hold a maximum of 18 electrons.
20 electrons would need 4 shells. The first shell can hold up to 2 electrons, the second shell can hold up to 8 electrons, the third shell can hold up to 18 electrons, and the fourth shell can hold up to 32 electrons.