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Which statement best describes how electrons fill orbitals in the periodic table?
O Electrons fill orbitals in order of their increasing energy from left to right.
O Electrons fill orbitals in order of their increasing energy from right to left.
O Elements fill orbitals in order of increasing energy from top to bottom in each group.
O Elements fill orbitals in order of increasing energy from bottom to top in each group.

fe 55.85 g/mol and h2o 18.02 g/mol.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.