What is the second quantum number of a 2s^2 electron in phosphorus,
1s^2 2s^2 2p6 3s^2 3p^3?
a. 1 = 0
b. 1-3
c. 1-2
d. 1= 1

l = 0

Explanation:

Second quantum number, also known as angular momentum quantum number (l), represents the shape of an orbital. Several quantum numbers and their corresponding orbital shapes are worth remembering:

Notice that the angular momentum quantum number might be identified solely from the letter. Since we're considering a orbital, this means we're dealing with an s orbital. As defined above, s-shaped orbital would have an l value of l = 0.

it should be p1 v1 = p2 v2

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.