How does the atomic radii trend explain the electronegativity trend?

Answer is: electronegativity decreases with increase of atomic radius, because of increased distance between the valence electrons and nucleus, so atoms tends to lose electrons easier.

Electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

The atomic radius of a chemical element is a measure of the size of its atom.The atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.The atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.

pure substance: iron,copper

impure substance: water,charcoal

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