AP EAPCET 06-Jul-2022 Shift 2 Paper

Electronic configuration of
Z=13 is 1s22s22p63s23p1‌. ‌
The maximum covalency of any element is found by counting the number of covalent and coordinate bonds that it can form.
So, the maximum covalency of element having Z=13 is 6 .
Since, it has 3 electrons in the valence shell, its highest oxidation state is +3.