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By the late eighteenth century, substances had been divided into inorganic and organic compounds.

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In those days, early in the history of organic chemistry, inorganic compounds were isolated from mineral sources, and organic compounds were obtained only from plants or animals. Organic compounds were more difficult to study in the laboratory, and decomposed more easily than inorganic compounds.

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The organic compounds we will discuss throughout this text contain carbon and a few other elements, such as hydrogen, oxygen, and nitrogen. We will also examine compounds containing sulfur, phosphorus, and halogens. Many, more exotic, organic compounds are also known, and organic compounds boratero trading limited been made that contain virtually every element in the periodic table.

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The molecule shown above is firefly luciferin, a light-emitting compound that is responsible for the characteristic emission of yellow light from many species of fireflies. The structure of luciferin is an example of the amazing variety of structures of organic compounds. They are everywhere in nature, including interstellar space. No known living organism can exist without organic compounds, and synthetic organic compounds are an integral part of the objects we use every day.

Organic chemistry is everywhere. Boratero trading limited physical and chemical properties of a molecule depend on the bonds that hold it together.

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And these bonds depend on the electron configurations of its atoms. Therefore, we will review some of the electronic features of atoms and the periodic properties of the elements before describing bonding and its relation to structure in organic compounds. Atomic Structure Each atom has a central, small, dense nucleus that contains protons and neutrons boratero trading limited are embedded in a sea of electrons. The atomic number, which equals the number of protons in the nucleus, determines the identity of an atom.

Because atoms have an equal number of protons and electrons and are electrically neutral, the atomic number also equals the number of electrons in an atom. The elements in the periodic table are arranged by atomic number. The elements are arrayed in horizontal rows called periods and vertical columns called groups. In this text, we will emphasize hydrogen in the first period and the elements carbon, nitrogen, and oxygen in the second period.

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The electronic structure of an atom determines its chemical reactivity. Atomic Orbitals The electrons in an atom occupy atomic orbitals, which are designated by the letters s, p, d, and f. Each orbital can contain a maximum of two electrons.

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An atomic orbital is a mathematical equation Organic Chemistry. All rights reserved. The square of the equation for the atomic orbital defines the probability of finding an electron within a given region of space.

Orbitals are grouped in shells of increasing energy, designated by the integers 1, 2, 3, 4. These integers are called principal quantum numbers. Each shell contains a unique number and type of orbital.

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The first shell contains a single 1s orbital. The second shell contains one 2s orbital and three 2p orbitals. Each orbital can contain no more than two electrons, and two electrons in any orbital must have opposite spin.

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We need to consider only the orbitals of the first three shells for the elements commonly found in organic compounds. All s orbitals are spherically symmetrical Figure 1. The 2s orbital is larger than the 1s orbital. A 2s orbital is farther from the nucleus, and it has a higher energy than a 1s orbital. The three p orbitals in a shell are not spherically symmetrical.

Electron density in each p orbital is concentrated in two regions or lobes—one on each side of the nucleus.

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The two lobes together are the orbital. The shapes of the p orbitals are shown in Figure boratero trading limited. The p orbitals are often designated as px, py, and pz.

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They are mutually perpendicular to one another, and they are aligned along the x, y, and z axes. Although the orientations of the px, py, and pz orbitals differ, the electrons in each p orbital have equal energies. Orbitals of the same type within a shell constitute a group called a subshell. For example, an s subshell has one orbital and can contain only two electrons.

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In contrast, a p subshell, which begins in period two, contains three p orbitals and can contain a total of six electrons. Electrons are distributed in subshells to give an electron configuration that has the lowest energy. For any subshell, the lowest energy state is the arrangement that maximizes the number of electrons having the same spin. This means that electrons first occupy orbitals one at a time within subshells before pairing in a common orbital.

Table 1.

An s orbital has a spherical boundary surface. Each orbital can hold a maximum of two electrons.