alkaline metals

atomic number

In chemistry and physics, the atomic number of a chemical element (also known as its proton number) is the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus. It is conventionally represented by the symbol Z.

periodic trends in periods

Modern quantum mechanics explains these periodic trends in properties in terms ... However in the d-block, trends across periods become significant

periodic trends in reactivity

left to right become less reactive again at the end noble gases are non reactive

anion

Anions are atoms or groups of atoms that have gained electrons. Having more negatively charged electrons than positively charged protons, they are negatively charged. The atoms that form ions most easily are the Group 17 (or VII) atoms, also called the halides: F, Cl, Br and I. All these form anions with a -1 charge.

alkaline earth metals

The alkaline earth metals are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). This group lies in the s-block of the periodic table as all alkaline earth metals have their outermost electron in an s-orbital.

proprieties of metalloids

A metalloid is a chemical element with properties in between, or that are a mixture of, those of metals and nonmetals.

alkali metals

Alkali metals are the chemical elements found in Group 1 of the periodic table. The alkali metals include: Lithium (Li), Sodium (Na), Potassium (K), Rubidium (RB), Cesium (Cs), and Francium (Fr).

inner transition metals

An inner transition metal is one of a group of chemical elements on the periodic table. They are normally shown in two rows below all of the other elements. They include elements 57-71 (lanthanides) and 89-103 (actinides). The lanthanides are very similar, and the actinides are all radioactive.

cation

An ion or group of ions having a positive charge and characteristically moving toward the negative electrode in electrolysis. An ion with net positive charge, having more protons than electrons. In electrolysis, cations migrate to a negatively charged cathode. Compare anion.

isotope

Each atomic number identifies a specific element, but not the isotope; an atom of a given element may have a wide range in its number of neutrons. The number of nucleons (both protons and neutrons) in the nucleus is the atom's mass number, and each isotope of a given element has a different mass number.

size of anions

Neutral atoms tend to increase in size down a group and across a period. When a neutral atom gains or loses an electron, creating an anion

proprieties of metals

On the Periodic Table, there are three major types of elements known as Metals, Non-Metals, and Metalloids. Here are a few properties of metals

mendeleev

Russian chemist who devised the Periodic Table, which shows the relationships between the chemical elements.

proprieties of nonmetals

Seventeen elements are generally classified as nonmetals; most are gases

proprieties of nonmetals

Seventeen elements are generally classified as nonmetals; most are gases (

halogens

The halogens are located on the left of the noble gases on the periodic table. These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

average atomic mass

The lighter isotope is more common with 69.09% of the naturally occurring copper having a mass of 62.93 amu per atom. The remainder of the atoms, 30.91 %, have a mass of 64.94 amu. To find the AVERAGE ATOMIC MASS of an atom, we take into account all of the isotopes that exist and the percentage of each type.

mass number

The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. Because protons and neutrons both are baryons, the mass number A is identical with the baryon number B as of the nucleus as of the whole atom or ion.

periodic trends in group

The number of energy levels increases as you move down a group as the number of electrons increases.

transition metals

The transition metals are the metallic elements that serve as a bridge, or transition, between the two sides of the table.

size of cations

eutral atoms tend to increase in size down a group and across a period. ... These cations are smaller than their respective atoms

noble gases

noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table.