1.

(A) x 3.(B) x 2(C)x4(D) noneBoron has two stable isotopes, 1B (relative abundance-1996) and "B (relative abundance-81%). Theatomiç mass (in amu) that should appear for boron in the periodic table is(A) 10.8(B) 10.2(C) 11.2(D) 10.6

Answer»

Atomic mass =10 *19+ 81 *11 /100 = 1081 /100 = 10.81



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