An atom of an element has a total of 12 electrons. an ion of the same element has a total of 10 electrons. which statement describes the charge and radius of the ion?
1. the ion is positively charged and its radius is smaller than the radius of the atom.
2. the ion is positively charged and its radius is larger than the radius of the atom. 3. the ion is negatively charged and its radius is smaller than the radius of the atom.
4. the ion is negatively charged and its radius is larger than the radius of the atom.

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