Time plays an important role in taking economic decisions for production. The distinction between fixed cost and variable cost is very much influenced by the time period. According to Marshall, there are three time periods.
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In naming the compounds of hydrogen with a more electronegative nonmetal (from the groups 16 and 17), the word hydrogen is followed by the nonmetal ending its name with –ide.
The electronic configuration of an element is defined as follows: A stepwise distribution of electrons in different orbits (energy levels) of an atom is called its electronic configuration. To write the electric configuration of an element, one should proceed as follows.
The electronic configuration of an element gives an idea about its reactivity. The elements having a completely filled outermost orbit (or shell) will be chemically inert (non-reactive). For example, the outermost shell in the case of helium (He), neon (Ne) and argon (Ar) are completely filled as shown below.
Each element has a definite electronic configuration. The electrons in the outermost shell of an atom are termed as its valence electrons. The valence electrons take part in the chemical reactions.
The relative atomic mass is denoted by Ar. The relative atomic mass is a pure number, and hence it has been no unit.
The average mass of an atom of an element is known as its atomic mass. Atomic mass of an element is designated as A. Since, atomic mass is actual mass, hence it has the unit of mass, viz, gram, kilogram, atomic mass unit, etc.
Elements are the basic constituents of all matter. An element is the simplest form of matter, which cannot split into simpler substances by any chemical or physical method.