Why does the Melting Point & Boiling Point of the Noble Gases increase as the periodic table decends?

Question

Is it something to do with the shielding of electon shells.

Thanks guys (& Gals of course)

Answer 1

The only force of attraction between adjacent atoms of atomic gases are very weak temporary dipoles set up when some of the electrons surrounding the atom concentrate more on one side than the other. This makes one side of the atom slightly more negative and the other side slightly more positive (due to the positive nature of the atomic nucleus) and therefore slightly attractive to the electrons of adjacent atoms.

As the atoms become larger the increased number of electrons means that the charges will tend to be more evenly dispersed so the dipoles become weaker. The nucleus is also deeper inside the atom so is able to exert less force on the electrons at the outer shell, let alone on the next atom.

As the attraction between particles in a substance is reduced the energy required to make it change state is also reduced ie lower melting and boiling points.

Answer 2

Boiling Point Of Noble Gases

Answer 3

No. The only form of intermolecular bonding in noble gases are dispersion forces, which require creation of instantaneous dipoles.

These forces are normally weak, but can be increased as the number of electrons in the atom increase, because the bond then becomes slightly more polarised.

As we move down the periodic table the mass and no. of electrons in each element increase, therefore dispersion forces between noble gases will also increase, leading to a higher m.p and b.p.

The electron shielding effect has to do with reactivity. For noble gases, reactivity is lowest at the top (Helium) because electrons are most tightly bound. As you move downt the period reactivity increases as the outermost electrons are further away from nucleus and therefore easier to be 'stolen'.

Answer 4

Hg and Br are the only liquids and H, He, N, O, F, Ne, Cl, Ar, Kr, Xe, and Rn are the only gases and all the rest are solids Just remember that the last group (last column) are all gases and memorize the rest. * I don't know of any periodic table that shows boiling and melting points on it.

Answer 5

No, the van Der Waals forces increase due to larger sizes and mass.

Answer 6

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its just how they are set out for example in the first group in the peridoic table the elements are set out from how they react with the air.