This is how sodium appears in the periodic table.
The arrow is pointing to sodium's
Na
number of neutrons.
number of valence electrons.
combined number of neutrons and protons.
combined number of electrons and protons.
Sodium
22.99

Wind or electric energy force force of friction

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.

Cis the answer  hope this : d