Consider the model of a sodium atom.

which feature does the model show accurately?

a)the size of the electrons in different shells
b)the shapes of the orbitals in different shells
c)the distribution of electrons in different shells
d)the orientation of the orbitals in different shells

Answer : Option C) The distribution of electrons in different shells.

Explanation : According to the attached image, the model of the sodium atom represents that the sodium atom has 12 neutrons and 11 protons in its nucleus. Also, there are 11 electrons which are distributed in different shells. The first shell contains 2 electrons, second has 8 electrons whereas third shell has only one electron it. Which defines the valency of the sodium, as 1. As it donates it's last electron to achieve an octet state.

the millers tale is the answer.

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