Sounds like the alkaline earth metals.
The outermost electron shell, known as the valence shell, contains the most reactive electrons. These electrons are involved in chemical reactions and interactions with other atoms to achieve a stable electron configuration, usually by gaining, losing, or sharing electrons.
Atoms can attain the same electron configuration as noble gases by either gaining, losing, or sharing electrons to achieve a full outer shell (valence shell) of electrons. This allows the atom to achieve stability similar to the noble gas configuration.
Cesium tends to lose electrons rather than gain them. As an alkali metal, cesium typically forms a +1 cation by losing its single valence electron to achieve a stable electron configuration.
When a chemical bond is formed, the constituent atoms acquire the valence electron configuration of noble gases called the octet rule or the stable electron configuration. This is achieved by sharing, gaining, or losing electrons to attain a full outer shell of electrons, similar to noble gases.
Octet configuration refers to how elements generally prefer to form bonds so as to attain an octet configuration, i.e. have 8 electrons in their valence shell. For example, chlorine (Cl) is from Group VII and has 7 valence electrons. It will gain one electron (eg from sodium which loses one electron to form Na+) to form Cl-, which has 8 valence electrons and so fulfills the octet rule and is stable. The electronic configuration of sodium is 2.8.1 (if you're in secondary school), or 1s2,2s2,2p6,3s1 (more advanced). So by losing one electron to form Na+, sodium also attains octet configuration.
Magnesium will lose 2 electrons to have the same electron configuration as Neon. Neon has a full valence shell with 8 electrons, and Magnesium has 2 valence electrons. By losing 2 electrons, Magnesium can achieve a full valence shell and the same electron configuration as Neon.
Losing an electron cesium has a noble gas configuration.
Sodium can become stable by losing 1 electron, forming a sodium ion with a 1+ charge, with the formula Na+. By losing its single valence electron, the resulting sodium ion achieves the noble gas configuration of neon, so that it has an octet (8) of valence electrons.
Aluminium has a 3 valence electrons, 3s2, 3p1
The outermost electron shell, known as the valence shell, contains the most reactive electrons. These electrons are involved in chemical reactions and interactions with other atoms to achieve a stable electron configuration, usually by gaining, losing, or sharing electrons.
Atoms can attain the same electron configuration as noble gases by either gaining, losing, or sharing electrons to achieve a full outer shell (valence shell) of electrons. This allows the atom to achieve stability similar to the noble gas configuration.
Cesium tends to lose electrons rather than gain them. As an alkali metal, cesium typically forms a +1 cation by losing its single valence electron to achieve a stable electron configuration.
Potassium has a valence of +1. This means that it typically forms ions with a positive charge of +1 by losing one electron to achieve a stable electron configuration.
A calcium atom must lose 2 electrons to have 8 valence electrons, achieving a full outer shell and stability. Calcium is in group 2 of the periodic table, so it has 2 valence electrons originally. By losing 2 electrons, it will have a stable electron configuration similar to a noble gas.
Barium forms an ion with a 2+ charge because it has 2 valence electrons in its outer shell. By losing these 2 electrons, barium achieves a stable electron configuration similar to a noble gas, which is energetically favorable.
Metal atoms are more likely to form ions by losing electrons, as they typically have few valence electrons in their outer shell. By losing electrons, metals can achieve a stable electron configuration similar to that of a noble gas.
When a chemical bond is formed, the constituent atoms acquire the valence electron configuration of noble gases called the octet rule or the stable electron configuration. This is achieved by sharing, gaining, or losing electrons to attain a full outer shell of electrons, similar to noble gases.