When ions form they have the electron configuration of: a) alkali metals b) alkaline earth metal c) halogens d) noble gas

Alkali metals have a general outermost electronic configuration of

Alkali earth metals have a general outermost electronic configuration of

The +1 ion of the alkali metals has a stable octet configuration of the nearest noble gas as the outermost ns electron is lost.

The +2 ion of the alkaline earth metals has a stable configuration of the nearest noble gas as the two electrons in the outermost ns shell are lost.

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