30me!
which is greater, the atomic radius of krypton (kr), or the ionic radius of strontium cation (sr^2+)? justify your answer in terms of nuclear charge, effective nuclear charge (z_eff), number of principle energy levels, and the shielding effect.

energy to lift something =

                (mass of the object) x (gravity) x (height of the lift).

but

this simple formula only works if you use the right units.

mass . . kilograms
gravity . . meters/second²
height . . meters

for this question . .

mass = 55 megagram = 5.5 x 10⁷ grams = 5.5 x 10⁴ kilograms

gravity (on earth) = 9.8 m/second²

height = 500 cm  =  5.0 meters

so we have

energy = (5.5 x 10⁴ kilogram) x (9.8 m/s²) x (5 m)

            =  2,696,925 joules .

that's quite a large amount of energy equivalent to
straining at the rate of 1 horsepower for almost exactly an
hour, or burning a 100 watt light bulb for about 7-1/2 hours.

the reason is the large mass that's being lifted.
on earth, that much mass weighs about 61 tons.

Answer it is also known as the completion state is untrue of the activation complex;