The elements of Group VIIA (new Group 17 – fluorine, chlorine, bromine, iodine, and astatine) are called the halogens (tan column). The term “halogen” means “salt-former” because these elements will readily react with alkali metal and alkaline earth metals to form halide salts.

Group 3 element

Group 17 contains halogens. They are highly reactive nonmetals. Group 18 consists of noble gases.

The name is derived from the english word potash. The chemical symbol K comes from kalium, the Mediaeval Latin for potash, which may have derived from the arabic word qali, meaning alkali.

Although people sometimes confuse them with one another, the two aren’t the same. Potassium is a mineral and not a vitamin, and the two nutrients function differently in the human body. Still, they both contribute to better bone and heart health, among other benefits.

How is potassium used today? The largest use of potassium is potassium chloride (KCl) which is used to make fertilizers. This is because potassium is important for plant growth. Industrial applications for potassium include soaps, detergents, gold mining, dyes, glass production, gunpowder, and batteries.

The element is quite abundant and makes up about 1.5 % by weight of the earth’s crust. Potassium is found extensively as potash (KOH). It is mined in Germany, USA, and elsewhere. Minerals such as sylvite (KCl), carnallite, and langbeinite, are found in ancient lake and sea beds.

Definition of Potassium Chloride Its chemical formula is KCl, consists of one potassium (K) atom and one chlorine (Cl) atom. An ionic compound is made of a metal element and a nonmetal element.

At high pressure the alkali metals potassium, rubidium, and cesium transform to metals that have a d1 electron configuration, becoming transition metal-like. They also have significant implications for the hypothesis that potassium is incorporated into Earth’s core.

Group 17 elements are the halogens, and these are definitely non-metals………

Halogens are nonmetals in group 17 (or VII) of the periodic table. Due to their high effective nuclear charge, halogens are highly electronegative. Therefore, they are highly reactive and can gain an electron through reaction with other elements.

Fluorine

The atoms of group 17 elements all have 7 electrons in the valence shell (highest energy level). And this is what people mean when they refer to an “atom” completing its “octet” of electrons (“oct” means 8). This is a stable electronic configuration.

noble gases

Group 18 are noble gases and have filled outer shells. Valency refers to the number of electrons required to fill the outer shell. Since their outer shells are complete- they don’t require any electrons. Therefore their valency is zero.

17

Group 1: Hydrogen and Alkali Metals It is the most common element in the universe. All the other elements in group 1 are alkali metals. They are the most reactive of all metals, and along with the elements in group 17, the most reactive elements.

Group 1

Elements in different groups are lumped together in one of three classes, depending on their properties. The classes are metals, nonmetals, and metalloids.

Aluminum (Al), also spelled aluminium, chemical element, a lightweight silvery white metal of main Group 13 (IIIa, or boron group) of the periodic table. Aluminum is the most abundant metallic element in Earth’s crust and the most widely used nonferrous metal….Aluminum.

In chemistry and atomic physics, the main group is the group of elements (sometimes called the representative elements) whose lightest members are represented by helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, and fluorine as arranged in the periodic table of the elements.

Abstract. The main group elements are classified as belonging to the s- and p-blocks in the periodic table. They range from gases such as fluorine and oxygen through nonmetals (e.g., boron, phosphorus, and sulfur) and semimetals (metalloids; e.g., germanium) to very reactive metals such as sodium and potassium.