What happens when a ray of light moves from air to water? its speed changes. its color changes. its direction changes. it’s absorbed by water.

When ray of light moves from air to water its speed changes and it bent away from surface.

Explanation:

When ray of light moves from less denser to more denser medium such from air to water its speed slow down and ray bent away from the surface (surface between air and water). The refraction is occur.

Refraction:

It is bending of light when it passes from one to another material.

It is measure as:

n = c / v

n = refractive index

c = speed of light in air

v = speed of light in medium

For example:

The refractive index of water is 1.33 it means light travel 1.33 times faster in vacuum as compared to water.

A ray of light passes from air to water and it bent away from the surface. The angle of refraction is less than the angle of incidence.

The bending also occur when light come from water and inter into air.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

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

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )