Atomic wt. of \( \mathrm{P} \) is math xmlns=http://www.w3.org/1998/Math/MathMLmn31/mn/math and ...

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Atomic wt. of \( \mathrm{P} \) is math xmlns=http://www.w3.org/1998/Math/MathMLmn31/mn/math and \( \mathrm{Sb} \) is math xmlns=http://www.w3.org/1998/Math/MathMLmn120/mn/math . What will be the atomic wt. of As, as per Dobereiners triad rule?
math xmlns=http://www.w3.org/1998/Math/MathMLmo(/momn1/mnmo)/momo /momn151/mn/math
math xmlns=http://www.w3.org/1998/Math/MathMLmo(/momn2/mnmo)/mo/math \( 75.5 \)
math xmlns=http://www.w3.org/1998/Math/MathMLmo(/momn3/mnmo)/mo/math \( 89.5 \)
math xmlns=http://www.w3.org/1998/Math/MathMLmfencedmn4/mn/mfenced/math Unpredictable
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