2 valence electrons
Explanation:
Electron configuration of nickel (Ni):
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸
The valence electrons are in the electronic shell with the higher principal quantum number (n). In our case, nickel have 2 electrons in the 4s², with the n = 4.
Learn more about:
electrons in the valence level
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Force on left crate, right crate and truck we need to draw here
First we will write the equation for left crate
Now similarly for right crate
now for truck
Now we know that F = 200 N
now add all three equation
now we will find all tension using this value of acceleration
The answers to the question above are letters B and D. For the first answer, m = F/A, if we cross multiply the terms, we get mA = F which is similar to the given expression. For the next answer, A = F/m, we also get Am = F if we do cross multiplication.
Answer:
0.614 nm
Explanation:
Energy of the nth state of one dimensional infinite wall is,
Given the energy to excite an electron from ground state to first excited state is,
And the Plank's constant is,
Mass of electron,
Now the energy will of a 1 dimensional infinite wall which excite an electron from ground state to first excited state will be,
Put all the variables in above equation and rearrange it for L.
Therefore the width of the box is 0.614 nm.