Assuming you mean sodium and potassium in metallic / liquid form, bonds are based on their affinity for that "extra" electron. Sodium has a slightly higher affinity, so its bond lengths can be a little shorter, making the nucleii closer together. Both sodium and potassium form (as metals) body-centered cubic structures, so the entire density difference is due to the bond strength.
Sodium has a higher MP than potassium does because the dispersion forces (electron and proton attraction forces) are much greater than those of potassium's. This is due to the distance of the valence electrons to the nucleus of the atom. The further the distance, the weaker the dispersion forces and thus the requirement of lesser amounts energy to break those bonds.
as we know, on moving down the group, generally there is increase in density. But moving from sodium to potassium, there is increase in charge by 8 units, but atomic radius of potassium got much increase due to presence of 3d subshell but in case of sodium, there is no presence of d subshell.
due to the addition of d-shell in electronic configuration of potassium volume of atom increases abruptly thus density decreases as a result it happens that the density is lower even than sodium.
No, a bit lower density: 0.968 g·cm−3,
Danger:Never put even a small crumb of it into contact with water, or even humid air: it will BURN and maybe explode!Due to large increase in Atomic radius from Na to K.
Both of them are in same group. It is because of molar mass of sodium is higher than lithium.
potassium is less dense than water
LOWER
Sodium Chloride has a higher melting point because at room temperature it is a solid but Ethyl alcohol has already melted, as it is liquid.
aluminum oxide : Al2O3
Calcium at 860 degrees celsius potassium melts at a mere 65 degrees celsius
KF has small size than KCl. So the packing of atoms / ions in KF is more than that in KCl. So a larger energy is needed to separate the atoms from solid state to liquid state and hence KF has higher melting point than KCl.
Sodium has a melting point of 97.72 oC and rubidium has a melting point of 39.48 oC.
The melting point of sodium chloride is 801 0C. The melting point of phosphorus trichloride is -93,6 0C.
LOWER
Sodium Chloride has a higher melting point because at room temperature it is a solid but Ethyl alcohol has already melted, as it is liquid.
Common table salt (sodium chloride) has a much higher melting point than either sodium or chlorine.
The elements like sodium and potassium are not malleable. They are soft and have low melting point.
The melting point of sodium chloride is 801 0C. The melting point of aluminium oxide is 2 072 0C.
Lower.
aluminum oxide : Al2O3
Caesium melts at 28.44oC, which is the lowest known melting point for any metallic element other than mercury. Certain radioactive elements might have lower melting points if it were possible to collect a large enough quantity of them to actually determine the melting point. For example, the melting point of francium is expected to be lower than that of caesium (but still higher than that of mercury). Also, some alloys melt at low temperatures. A eutectic alloy of sodium and potassium melts at around -12oC, still higher than mercury, but below caesium (and well below either sodium or potassium alone as well).
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The melting point of sodium chloride is 801 0C.