According to the Heisenberg uncertainty principle, a) The position of a particle

Question

According to the Heisenberg uncertainty principle,
a) The position of a particle cannot be measured precisely
b) The momentum of a particle cannot by measured precisely.
c) The position and momentum of a particle can be measured precisely, but not at the same time.

Which of the following represent electron configurations that are allowed but do not represent ground-state configurations?
A) [Ne]3s1 3p5 B)[Kr]4d12 5s2 5p3 C)[Ar]3d10 4s2 4p2

a) Only (A)
b) Only (B)
c) (A) and (B)
d) (B) and (C)


Calculate the energy change for the formation of MgBr2 (s) from its elements in their standard states:
Mg(s) + Br2 (l) ? MgBr2 (s) ?
Mg(s) ? Mg(g) +147.1 kJ/mol
Mg(g) ? Mg+ (g) + e- +737.8 kJ/mol
Mg+ (g) ? Mg2+ (g) + e- +1451 kJ/mol
Br2 (l) ?Br

Explanation / Answer

#3 is A. -499

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