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Comparitively lithium reacts less vigorously than sodium , Because due to it’s small size it readily gets hydrated whereas other alkali metals (Na, K,RB,Cs,Fr) are larger in size due to their increasing in shells takes enough time to get hydrated , Hence lithium react less vigorously than sodium.
On moving down the group, the electropositive nature increases; hence sodium is more electropositive than lithium and also the size of sodium is greater than lithium. So Sodium reacts more vigorously with water than Lithium.
Its single outer electron makes the metal highly reactive and ready to combine with others at the first opportunity – such as the moment the metal hits water. According to the textbooks, these reactive electrons rip apart the surrounding water molecules to release hydrogen gas and heat.
In this dramatic demonstration, lithium, sodium, and potassium react with water to produce hydrogen gas and the hydroxides of the metals. Lithium reacts fairly slowly, fizzing. … The solution turns pink as the metals react to form their hydroxides.
Lithium reacts intensely with water, forming lithium hydroxide and highly flammable hydrogen. The colourless solution is highly alkalic.
Sodium is more electropositive than lithium because electricity increases from the rights side to the left side of the periodic table along a group.
So, the lower density of lithium (it being lighter than other elements), and high energies of atomization and hydration make the reaction of Lithium with water less vigorous than the reaction of other alkali metals with water. Other alkali metals have less positive atomization and hydration enthalpies.
In what way and in what form does sodium react with water? A colourless solution is formed, consisting of strongly alkalic sodium hydroxide (caustic soda) and hydrogen gas. This is an exothermic reaction. Sodium metal is heated and may ignite and burn with a characteristic orange flame.
Sodium also floats on the surface, but enough heat is given off to melt the sodium (sodium has a lower melting point than lithium and the reaction produces heat faster) and it melts almost at once to form a small silvery ball that dashes around the surface.
Lithium: Lithium’s density is only about half that of water, so it floats on the surface, fizzing and giving off hydrogen gas. … The reaction generates heat slowly, and lithium’s melting point is too high for it to melt (this is not the case for sodium).
Sodium reacts vigorously with water because it is much more active than hydrogen. Therefore, a redox reaction between H+ and Na to give H(2) and Na+ is very energetically favorable. So much energy is released that the hydrogen gas released can burn.
The reason is that lithium is much too reactive and has too low a melting point to be much use in hydraulic engineering. A violent reaction takes place on contact between Lithium and water. The heat of reaction is enough to melt the lithium metal and ignite the hydrogen gas that is produced by the reaction.
Sodium reacting with water is an exothermic reaction (releases heat). Sodium has a low melting point, so melts and forms a ball. Sodium is less dense than water so it floats.
It also increases the distance between the positive nucleus and the outer shell. So nuclear attraction decreases. As a result of this, sodium’s ability to pull onto electrons is lower than that of lithium’s. Thus sodium is more electropositive than lithium.
The net pull from each end of the bond is the same as before, but the lithium atom is smaller than the sodium atom. That means that the electron pair is going to be more strongly attracted to the net +1 charge on the lithium end, and thus closer to it.
Because hydrogen is a nonmetal while sodium is a metal and tends to lose electrons because of metallic bonds present. That’s why the electropositivity value of sodium is greater than hydrogen. The elements that can easily lose electrons to form positive ions are called electropositive elements, for example: metals.
Sodium is the alkali element that reacts most violently with water.
Sodium reacts with cold water to form sodium hydroxide and hydrogen gas.
Sodium is a soft, easily tarnished, alkali metal. It is not found as a pure metal in nature due to its highly reactive nature. Sodium is so highly reactive that it can cause explosions with just water (see video below).
A metal is said to be reactive if it is highly electropositive in nature and readily loses its electrons in a reaction. Sodium metal has very low ionization energy and therefore readily loses its electron.
Sodium. When sodium is added to water, the sodium melts to form a ball that moves around on the surface. It fizzes rapidly, and the hydrogen produced may burn with an orange flame before the sodium disappears.
All of the other metals on the periodic table are denser than water. While lithium, potassium, and sodium are all light enough to float on water, they are also highly reactive. When placed in water, they burn or explode.
Sodium is ordinarily quite reactive with air, and the reactivity is a function of the relative humidity, or water-vapour content of the air. The corrosion of solid sodium by oxygen also is accelerated by the presence of small amounts of impurities in the sodium.