Decide which element probably has a density most and least similar to the density of potassium. Comparing density: lead rubidium thallium xenon
most similar to potassium
least similar to potassium

most similar to potassium   = rubidium

least similar to potassium  = thallium

Explanation:

The density of an element is the number of particles per unit volume. To determine the element with the most probable density and the least density, we need to know their density values.

For potassium, density = 0.862 g/cm³

Density of lead = 11.35 g/cm³

Density of rubidium = 1.63 g/cm³

Density of thallium = 11.85 g/cm³

Density of xenon = 5.9  g.cm³

So from their density values, the density that has the most similar density to potassium is rubidium.

The element that is least similar to potassium is thallium.

a non redox reaction occurs when there is not a transfer of electrons. for redox reactions, which are reduction-oxidation reactions, a change in the oxidation number occurs. elements that are reduced gain electrons, and elements that are oxidized lose electrons.

explanation:

the tides are influenced by both the moon and the sun, it's easy to see that when the sun lines up with the moon and the earth, as during a new moon or full moon, the tidal effect is increased. these are known as spring tides, named not for the season, but for the fact that the water "springs" higher than normal. on the other hand, if the sun and the moon are 90 degrees apart in relation to an observer on earth as during the first quarter moon or third quarter moon, then high tides are not as high as they normally would be. this is because despite its greater distance, the sun's mass allows it to exert enough gravitational force on the oceans that it can negate some of the effects of the moon's pull. this phenomenon of lower high tides is called a neap tide. if you need more information on this topic visit moonconnection.com.