Periodic law: properties of the elements are periodic function of their atomic numbers. periodic table: table of the elements that places elements with similar chemical properties close together. pnictogen: element in group 15. representative element: (also, main group element) element in columns 1, 2, and 12–18. A modern periodic table arranges the elements in increasing order of their atomic numbers and groups atoms with similar properties in the same vertical column ( figure 3.46 ). each box represents an element and contains its atomic number, symbol, average atomic mass, and (sometimes) name. the elements are arranged in seven horizontal rows.
Transcript. the periodic table organizes elements into groups and periods based on their chemical and physical properties. elements in the same group share similar characteristics, like reactivity. the table is divided into metals, nonmetals, and metalloids, each with distinct properties. key groups include alkali metals, alkaline earth metals. The alkali metal with 11 protons and a mass number of 23. the noble gas element with and 75 neutrons in its nucleus and 54 electrons in the neutral atom. the isotope with 33 protons and 40 neutrons in its nucleus. the alkaline earth metal with 88 electrons and 138 neutrons. The periodic table is an arrangement of the elements in order of increasing atomic number. elements that exhibit similar chemistry appear in vertical columns called groups (numbered 1–18 from left to right); the seven horizontal rows are called periods. some of the groups have widely used common names, including the alkali metals (group 1. The periodic table. licenses and attributions : . : . previous next skip to main content general college chemistry i. appendices. search for: the periodic table.
The periodic table is an arrangement of the elements in order of increasing atomic number. elements that exhibit similar chemistry appear in vertical columns called groups (numbered 1–18 from left to right); the seven horizontal rows are called periods. some of the groups have widely used common names, including the alkali metals (group 1. The periodic table. licenses and attributions : . : . previous next skip to main content general college chemistry i. appendices. search for: the periodic table. The periodic table is one of the cornerstones of chemistry because it organizes all the known elements on the basis of their chemical properties. a modern version is shown in figure \ (\pageindex {1}\). most periodic tables provide additional data (such as atomic mass) in a box that contains each element’s symbol. The horizontal rows of the periodic table are called periods. the period number is indicated outside of the periodic table on the left. in the figure below, the 4 th period is highlighted in green. the uppermost row contains the two elements hydrogen and helium. this row is referred to as the first period.
The periodic table is one of the cornerstones of chemistry because it organizes all the known elements on the basis of their chemical properties. a modern version is shown in figure \ (\pageindex {1}\). most periodic tables provide additional data (such as atomic mass) in a box that contains each element’s symbol. The horizontal rows of the periodic table are called periods. the period number is indicated outside of the periodic table on the left. in the figure below, the 4 th period is highlighted in green. the uppermost row contains the two elements hydrogen and helium. this row is referred to as the first period.
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