Question

Which of the following best summarizes the quantum model of atoms?


A. Electrons reside in known positions in fixed orbits around the nucleus.
B. Electrons are waves that travel in known paths around the protons.
C. Electrons display some properties of waves and while they reside outside of the nucleus, their positions cannot be known with certainty.

Answer 1

I think B not sure

Answer 2

C makes more sense.

Answer 3

okay thanks so I should put c ?

Answer 4

The answers are a bit ambiguous but I would put C.

Answer 5

Why does electrical current always flow from areas of negative charge to areas of positive charge?


A. the current is made up of electrons that carry negative charge and are pulled toward positive charge
B. the current is made of positive charge that wants to move closer to more positive charge
C. the current is made of protons that originate only in areas of negative charge
do you guys know this one ?

Answer 6

A.

Answer 7

thanks how about this one
Thomson suggested a plum pudding model of the atom. In this model


A. the atom has a concentrated positively charged nucleus and electrons that move around it
B. the atom has a cloud of positive charge with electrons randomly embedded in it
C. the atom has a central nucleus with electrons that reside in specific energy levels around it

Answer 8

B.

Answer 9

C. Heisenberg's uncertainty principle puts a limit on knowing electron position, so A is out. While electrons do travel as waves around the nucleus, they don't travel in know paths. At best orbitals look like blurred clouds Remember: Heisenberg's uncertainty principle also puts a limit on what we can know about an electron's momentum (part of which is path). That means B is out, too.

Answer 10

@justize99, Thomson's plum model is little different than Bohr's model. Both accurately state that electrons have well defined energy states while confined to the atom. Thomson's model leaves out important features though: degeneracy of energy levels; angular momentum and spin of electrons. Those are just a few of the things missing.

I think it's best to consider the electrons at fixed energy levels moving about fuzzy cloud-like areas defined by each electrons wave function and probability distribution

Answer 11

C is the right answer.....
Electrons display some properties of waves and while they reside outside of the nucleus, their positions cannot be known with certainty.

Answer 12

c is correct.