The alkali metal family includes the six elements in thefirst columnof the periodic table, fromlithium(Li) down to francium (Fr). These metals all contain one valence electron, meaning they form cations and react readily with water. These elements form the ionic bonds known as salts. Hydrogen...
Periodic Table of Elements - The periodic table is the tabular arrangement of all the chemical elements on the basis of their respective atomic numbers. In the periodic table, the vertical columns are called groups and the horizontal rows are called peri
Take this quiz on the first 20 elements of theperiodictable. How well do you understand the periodic table and what it involves? Can you correctly name the first 20 chemical elements, their atomic numbers, electron configurations, and chemical properties? Let's test your knowledge! You can als...
1. The Elements and The Periodic Table(元素和周期表) The number of protons in the nucleus of an atom is referred to as the atomic number, or proton number, Z. The numbers of electrons in an electrically neutral atom is also equal to the atomic number, Z. The total mass of an atom ...
Physical and chemical properties of Niobium: general data, thermal properties, ionization energies, isotopes, reduction potentials, abundance of elements, crystallographic data.
There are 18 groups in the standard periodic table. Elements in a group have similar configurations of their valence shell electrons, which gives them similar properties. Group numbers There are three systems of group numbers; one using Arabic numerals and the other two using Roman numerals. The...
Group numbers Gallery of images The group number is an identifier used to describe the column of the standard periodic table in which the element appears.Groups 1-2 termed s-block elements.Groups 1-2 (except hydrogen) and 13-18 are termed main group elements....
: a law in chemistry: the elements when arranged in the order of their atomic numbers show a periodic variation of atomic structure and of most of their properties Word History First Known Use 1872, in the meaning defined above Time Traveler The first known use of periodic law was in ...
Here is a list of all of the chemical elements of the periodic table ordered by increasing atomic number. The names and element symbols are provided.
1. The Elements and The Periodic Table元素和周期表The number of protons in the nucleus of an atom is referred to as the atomic