Rutherford’s nuclear model of the atom helped explain why atom of different aspects exhibit different rebab.netical behavior. The identity of an facet is identified by that atomic number (Z), the number of protons in the cell core of an atom the the element. The atomic number is therefore different for each element. The known facets are i ordered it in order of raising Z in the periodic table (Figure (PageIndex1)). The rationale because that the peculiar layout of the routine table is defined later. Each aspect is assigned a unique one-, two-, or three-letter symbol. The surname of the aspects are detailed in the routine table, along with their symbols, atomic numbers, and atomic masses. The rebab.netistry of each facet is determined by its number of protons and also electrons. In a neutral atom, the number of electrons equates to the variety of protons.

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Figure (PageIndex1): The regular Table mirroring the aspects in stimulate of raising Z. The steels are ~ above the bottom left in the regular table, and the nonmetals are at the peak right. The semimetals lie along a diagonal line separating the metals and nonmetals. One interactivePeriodic table deserve to befound here.

The aspects are arranged in a routine table, which is most likely the solitary most crucial learning help in rebab.netistry. The summarizes huge amounts of information around the aspects in a way that facilitates the forecast of countless of their properties and rebab.netical reactions. The elements are i ordered it in seven horizontal rows, in order of boosting atomic number indigenous left to right and also top to bottom. The rows are dubbed periods, and also they room numbered from 1 to 7. The facets are stacked in together a method that aspects with comparable rebab.netical properties type vertical columns, dubbed groups, numbered from 1 to 18 (older periodic tables usage a system based on roman numerals). Groups 1, 2, and also 13–18 space the main group elements, provided as A in older tables. Teams 3–12 space in the center of the periodic table and are the shift elements, listed as B in older tables. The two rows the 14 facets at the bottom the the routine table room the lanthanides and the actinides, who positions in the periodic table are suggested in team 3.


Metals, Nonmetals, and also Semimetals

The heavy orange zigzag line to run diagonally native the top left to the lower right through teams 13–16 in number (PageIndex1) divides the facets into metals (in blue, below and also to the left of the line) and also nonmetals (in bronze, above and come the best of the line). Gold-colored lements the lie follow me the diagonal line exhibit nature intermediate in between metals and also nonmetals; lock are referred to as semimetals.

The distinction between metals and nonmetals is just one of the most an essential in rebab.netistry. Metals—such together copper or gold—are great conductors that electricity and also heat; they can be pulled into wires because they are ductile; they deserve to be hammered or pressed into thin sheets or foils because they space malleable; and also most have a glowing appearance, so they room lustrous. The vast majority of the known facets are metals. Of the metals, only mercury is a liquid at room temperature and pressure; every the remainder are solids.

Nonmetals, in contrast, are generally poor conductors of heat and also electricity and also are not lustrous. Nonmetals can be gases (such as chlorine), liquids (such together bromine), or solids (such as iodine) at room temperature and also pressure. Many solid nonmetals room brittle, therefore they break into small pieces when hit with a hammer or pulled right into a wire. Together expected, semimetals exhibit nature intermediate in between metals and nonmetals.

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Exercise (PageIndex1)

Based ~ above its ar in the regular table, execute you intend indium to be a nonmetal, a metal, or a semimetal?

Answer

metal


As previously noted, the regular table is i ordered it so that elements with similar rebab.netical behaviors are in the very same group. rebab.netists frequently make basic statements about the properties of the facets in a group using descriptive surname with historical origins. For example, the aspects of team 1 are known as the alkali metals, group 2 room the alkaline planet metals, team 17 room the halogens, and Group 18 room the noble gases.