How many valence(outer shell)electrons are present in the at

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How many valence(outer shell)electrons are present in the atoms of the element with atomic number51
(about Chemistry)

Sb arrangement of extranuclear electrons：1s⑵ 2s⑵2p⑹ 3s⑵3p⑹3d⑽ 4s⑵4p⑹4d⑽ 5s⑵5p⑶
arrangement of valence(outer shell)electrons ：5s25p3
so the valence(outer shell)electrons either are 3 or 5.

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