It should have 10 electrons
Precision
Precision: A measure of how closely individual measurements agree with one another. Accuracy: Refers to how closely individual measurements agree with the correct or true value.
Answer:
134.8 seconds is the half-life (in seconds) of the reaction for the initial
concentration
Explanation:
Half life for second order kinetics is given by:

Integrated rate law for second order kinetics is given by:

= half life
k = rate constant
= initial concentration
a = Final concentration of reactant after time t
We have :

Initial concentration of ![C_2F_4=[a_o]=\frac{0.438 mol}{2.42 L}=0.1810 mol/L](https://tex.z-dn.net/?f=C_2F_4%3D%5Ba_o%5D%3D%5Cfrac%7B0.438%20mol%7D%7B2.42%20L%7D%3D0.1810%20mol%2FL)
Rate constant = k = 



134.8 seconds is the half-life (in seconds) of the reaction for the initial
concentration
C. Protons
Protons are subatomic particles found in the nucleus and carry positive electrical charge.