Atoms in Group 18(8A) are inert (chemically unreactive) because A
they combined to form molecules.
B
they have no valence electrons.
С
they have filled inner energy levels.
D
they have a full valence shell.

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

Name the intersection of plane bpq and plane cpq.