Explanation:
Principle Quantum Numbers : It describes the size of the orbital and the energy level. It is represented by n. Where, n = 1,2,3,4....
Azimuthal Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...
s = 1 orbital
p = 3 orbitals
d = 5 orbitals
f = 7 orbitals
For n = 4
l = 0 to (n-1) = 0 to 3 = (4s , 4p , 4d , 4f)
Number of subshells = 4
Number of orbitals = 1 + 3 + 5 + 7 = 16
The maximum number of electrons the n = 4 shell can contain:
Each orbital can holds upto two electrons, then 16 orbitals will have :

32 is the maximum number of electrons the n = 4 shell can contain
Answer : The volume occupied by lead is, 2.20 mL
Explanation :
Density : It is defined as the mass contained per unit volume.
Formula used for density :

Given :
Mass of an lead = 25.0 grams
Density of lead = 11.34 g/mL
Now put all the given values in the above formula, we get the volume of lead.


Therefore, the volume occupied by lead is, 2.20 mL
Answer:
Frequency, Wavelength, Crest, amplitude, trough, sound waves, all of the above
Explanation:
By decreasing n we can increase presure because decrease in n will shift equilibrium to either forward or reverse direction