The periodic table is an arrangement of the elements in order of increasing atomic number. Each group is located in a different part of the periodic table. Elements are either metals, nonmetals, or metalloids (or semi metals). All known isotopes are radioactive and have short half-lives (22 minutes is the longest).\): Types of Elements.
This module will explore several aspects of the element and how they apply to the world. It is a component of water (H2O), fats, petroleum, table sugar (C6H12O6), ammonia (NH3), and hydrogen peroxide (H2O2)-things essential to life, as we know it. Chemistry of Hydrogen (Z=1) Hydrogen is one of the most important elements in the world.Reactions of Group I Elements with Oxygen.Reactions of Group I Elements with Chlorine.Reactions of Group 1 Elements with Water.All these characteristics can be attributed to these elements' large atomic radii and weak metallic bonding. They also have low boiling and melting points and are less dense than most elements.
These metals are characterized by their soft texture and silvery color. They tend to donate their electrons in reactions and have an oxidation state of +1. This is due in part to their larger atomic radii and low ionization energies. Group 1: Reactivity of Alkali Metals Alkali metals are among the most reactive metals.Sections below cover the trends in atomic radius, first ionization energy, electronegativity, melting and boiling points, and density. Group 1: Properties of Alkali Metals This page discusses the trends in some atomic and physical properties of the Group 1 elements - lithium, sodium, potassium, rubidium and cesium.