You mean group VII of the Periodic Table? Group VII elements are known as halogens and they form -1 ions readily is as they only require 1 more electron to obtain full electronic configuration. They all lack 1 valence electron in their valence shells. Full electrion configuration means that there aren't any valence electrons.
Divalent cation: Ca2+ Trivalent anion: (PO4)3-
Because group 1 has 1 electron in it's outer most shell and the have to fill the energy level, so they gave there electron and form positive ion (cation). And group 17 has 7 electrons in it's outer most shell and they need to complete their shell so the gain electron and form negative ion (anion).
Main group group A elements are also known as representative elements and they include elements in the s and p blocks of the periodic table. They typically form ions with a positive charge by losing electrons and tend to be found in nature in their elemental forms. These elements are involved in a wide range of chemical reactions due to their relatively low ionization energies.
The elements of the 1st GROUP of the periodic table are called alkali metals. The elements of the 17th GROUP of the periodic table are called halogens. Alkali metals are soft metals whereas halogens are non-metals.
Native elements are minerals that exist in a relatively pure form, composed of a single element. Examples include gold, silver, copper, and diamond. These minerals are typically found in nature in their elemental form without combining with other elements.
You can determine the number of covalent bonds an element can form by looking at its group number on the periodic table. Elements in group 4 can typically form 4 covalent bonds, elements in group 5 can form 3 bonds, elements in group 6 can form 2 bonds, and elements in group 7 can form 1 bond.
The Group 7A elements, also known as the halogens, typically form ions with a charge of -1. This is because they only need to gain one electron to achieve a stable electron configuration similar to the nearest noble gas.
The most common negative oxidation state in Group 13 elements is -3. This is particularly seen in compounds where these elements form three bonds with more electronegative species.
Divalent cation: Ca2+ Trivalent anion: (PO4)3-
The oxidation number for group 2 elements is typically +2. These elements have 2 valence electrons that they can lose to form a 2+ cation.
Nonmetals typically form negative ions by gaining electrons to achieve a stable electron configuration. For example, fluorine, chlorine, and oxygen commonly form negative ions by gaining one or more electrons.
Group that tend to form -1 ions include group VIIA
Group 3 elements typically have an oxidation state of +3. This is because they have 3 valence electrons that they can lose to form stable compounds.
Hydrogen is separate from the rest of Group 1A elements because it displays unique properties that do not fit the typical characteristics of alkali metals (Group 1A elements). For example, hydrogen can form both positive and negative ions, while other Group 1A elements typically form only positive ions. Additionally, hydrogen can exhibit nonmetallic properties in addition to metal-like behavior, setting it apart from the rest of Group 1A.
Group 15 elements, also known as the nitrogen group, typically have an oxidation number of -3 when they form ions. This group includes elements such as nitrogen, phosphorus, arsenic, antimony, and bismuth.
Elements in group 17 of the periodic table are known as the halogens. The halogens include fluorine, chlorine, bromine, iodine, and astatine. These elements are very reactive because of their electron configuration, which is one electron short of a more stable nobel gas configuration.
Elements located on the right side of the periodic table, particularly the nonmetals in Group 17 (the halogens), are most likely to form negative ions. These elements, such as fluorine and chlorine, have high electronegativities and readily gain electrons to achieve a stable electron configuration, forming anions. Additionally, elements in Group 16, like oxygen and sulfur, can also form negative ions by gaining electrons.