valence electron of gallium,germanium,arsenic,selenium
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Answer:
Gallium is in Period 4, Group 13, so its valency should be +3
Germanium atoms have 32 electrons and 32 protons with 4 valence electrons in the outer shell.
An arsenic atom has 33 electrons and 33 protons with five valence electrons
Selenium has 6 electrons located in the outermost shell
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