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.

there all right good

explanation:

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j