Answer:
Wait, that can happen? I'm sorry.
Explanation:
 
        
                    
             
        
        
        
Answer is D - five.
<em>Explanation;</em>
- Electron dot diagrams show the valence electrons around the element by using dots. 
- Valence electrons are the electrons which are in outermost shell of the atom.
-The atomic number of the N atom is 7. 
      Atomic number = number of protons = 7
   If the atom is neutral,
       number of protons = number of electrons.
   Hence, N atom has 7 electrons.
- The electron configuration is 1s² 2s² 2p³.
Hence, N atom has 2 + 3 = 5 valence electrons. So, five electrons are represented in electron dot diagram of N.
 
 
        
                    
             
        
        
        
The answer is D=M/V hope it helps!!
        
                    
             
        
        
        
Answer: 1.176×10^-3 s
Explanation: The time constant formulae for an RC circuit is given below as 
t =RC
Where t = time constant , R = magnitude of resistance = 21 ohms , C = capacitance of capacitor = 56 uf = 56×10^-6 F
 t = 56×10^-6 × 21
t = 1176×10^-6
t = 1.176×10^-3 s