How many valence electrons are in the chemical hafnium?

Their are 4 electrons just had the same problem

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.