While scientists categorize the chemical elements as metals, nonmetals, and metalloids largely based on the elements' abilities to conduct electricity at normal temperatures and pressures, there are other distinctions that are taken into accou...
This periodic table of elements provides comprehensive data on the chemical elements including scores of properties, element names in many languages and most known nuclides (Isotopes). Below the table there is a "Periodic Table Sorted By" section with links that will sort chemical elements by vario...
Secondary School ScienceThe article reviews the educational DVD "The Periodic Table of the Elements: Metalloids," a video for students in middle school and higher.doi:10.1021/ed027p510Mandell, Phyllis...
The Periodic Table groups elements into the cobalt, chromium, vanadium, scandium, copper, cobalt, and other groups. PeriodsThere are 7 periods of elements that group elements with similar properties. Period 1 contains two elements, helium and hydrogen while period 7 contains radioactive elements. T...
Objectives: Understand how scientists organize the elements Learn about the properties of metals, nonmetals, and metalloids Dimitri Mendeleev Given credit for creating the first periodic table in 1869 He arranged the elements according to the atomic mass He was able to predict the existence of other...
Metalloids or Semimetals Electronegativity and ionization energy intermediate between that of metals and nonmetals May possess a metallic luster Variable density, hardness, conductivity, and other properties Often make good semiconductors Reactivity depends on the nature of other elements in the reaction ...
These elements sometimes behave as semiconductors (B, Si, Ge) rather than as conductors. Metalloids are also called "semimetals" or "poor metals." Nonmetals: Everything else to the upper right of the staircase — plus hydrogen (H), stranded way back in Group 1 — is a nonmetal. These ...
Elements on the borderline between metals and nonmetals are called metalloids. Group 1 (with one valence electron) and Group 2 (with two valence electrons) are called the alkali metals and the alkaline-earth metals, respectively. Two series of elements branch off from Group 3, which contains ...
Periodic table of elements with information on chemical elements like gold, silver, iron, neon, helium, chlorine, copper, cobalt, and more
In the periodic table of the elements, elements are arranged in a series of rows (or periods) so that those with similar properties appear in vertical columns. Elements of the same period have the same number of electron shells; with each group across a period, the elements have one more ...