Señalar algunos aspectos que resulten similares u otros que resulten diferentes en la concepción actual que se tiene del átomo (modelo de la nube electrónica) y la que se tenía en los distintos modelos anteriores que se tenía del mismo. (lo siguiente es un cuadro) Modelo atómico Al igual que el modelo actual propone… A diferencia del modelo actual propone
Demócrito
Dalton
Thomson
Rutherford
Bohr

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

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.