Among CrO, Cr2O3 and CrO3, the sum of spin-only magnetic moment values of basic and amphoteric oxides is ______

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Oxide	Nature	Electronic configuration of central metal ion	Number of unpaired electrons (n)	Spin only magnetic moment ( $μ$ ) = $\sqrt{n (n + 2)}$ BM
$CrO$	Basic	${Cr}^{+ 2} = {}_{18}{[Ar]} 3 d^{4} 4 s^{0}$	4	$\sqrt{4 (4 + 2)} BM = 4.9 BM$
${Cr}_{2} O_{3}$	Amphoteric	${Cr}^{+ 3} = {}_{18}{[Ar]} 3 d^{3} 4 s^{0}$	3	$\sqrt{3 (3 + 2)} BM = 3.87 BM$
${CrO}_{3}$	Acidic	${Cr}^{+ 6} = {}_{18}{[Ar]} 3 d^{0} 4 s^{0}$	0	0