For an element with atomic number 35, which one of the following will be the correct number of electrons in its valence shell based on Bohr's model of an atom?

- Bohr's model describes electrons orbiting the nucleus in specific energy levels or shells (K, L, M, N, etc.). - The maximum number of electrons a shell can hold is generally given by 2n², where n is the shell number (n=1 for K, n=2 for L, etc.). - For atomic number 35 (Bromine), we fill the shells sequentially: - K shell (n=1): 2 electrons (capacity 2) - L shell (n=2): 8 electrons (capacity 8) - M shell (n=3): 18 electrons (capacity 18) - N shell (n=4): The remaining electrons: 35 - (2 + 8 + 18) = 35 - 28 = 7 electrons. - The outermost shell is the valence shell, which is the N shell in this case. - The number of electrons in the valence shell is 7.