Phosphorus has an atomic number of 15, so what is the distribution of its electrons in an uncharged atom?a. The first energy level has two, the second has eight, and the third has five. b. The electron arrangement cannot be determined from the atomic number alone. c. The first energy level has eight and the second has seven. d. The first energy level has two and the second has 13. e. The first, second, and third energy levels have five electrons each.

a. The first energy level has two, the second has eight, and the third has five.      

Explanation:

In the periodic table , all of the elements are arranged according to the atomic number , the phosphorus is groups at position 15 and hence the atomic number is 15 .

The electrons of the elements are arranged according to the stability of the electrons , which is decided by the octet rule , where the stable electronic configuration is - 2 , 8 , 8 , 18...

i.e. ,

In the first shell maximum two electrons can reside , and in the second shell , maximum eight electrons can reside ,and so on.

Hence , determining the electron configuration as follows -

P ( 15 ) - 2 , 8 , 5 .

water   molecules stay close to each other through cohesion, the collective action of hydrogen bonds between water molecules. cohesion plants draw water upwards from the root through the stem's transport tubes (xylem) to the leaf. this transport occurs even in large trees and against gravity. transpiration, evaporation of water from plant leaves, creates a tension on water molecules being pulled up from the stem and roots.

water also has high (the attraction of one substance to another) properties because of its polar nature. adhesion of water molecules to plant cell walls counteract gravity while water is transported from roots to leaves.

water exhibits a very high surface tension when compared to other liquids. surface tension is a property of a liquid that holds the surface together and allows it to resist an external force. by capillary action, the water forms concave menisci inside the pores. the high surface tension of water pulls the concavity outwards, generating enough force to lift water from the roots to the leaves of plants.

thus, cohesion, along with adhesion and surface tension creates a capillary action that keeps water molecules interacting and moving through the plants out to the leaf cells.

therefore, option d) is the correct answer.

explanation:

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.