How many lone pairs are on the central atom in bcl3? express your answer numerically as an integer?

If we draw the lewis structure, we can see that all Cl atoms are all connected to the B atom. Now Cl atoms has 7 electrons each on its outermost shell while B can donate 3 electrons. So by octet rule, each Cl will gain 1 electron each from the B atom. From the Lewis structure, we can see that there are actually No Lone pairs on the central atom.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

i'm assuming that the correct answer is indeed the first one/ "a"..