Because the electrons from the outer shell of an atom are the agents of chemical reactions.
The electron shells and the numbers of electrons present in them.
An element's chemical properties are determined primarily by its electron configuration, which influences how it will react with other elements to form compounds. The number of protons in the atom's nucleus also plays a role in determining its chemical properties. Additionally, factors such as atomic size, electronegativity, and valence electrons contribute to how an element will interact chemically with other elements.
All the members of a group of elements have similar chemical properties because they all have the same number of electrons in their valence bands. The periodic table of elements is arranged this way, that is, by electron structure. The vertical columns are the groups of elements, and it is their electron structure that places them where they are.
The chemical properties of elements are primarily due to their electron configuration and the number of valence electrons they possess. These factors determine an element's reactivity, tendency to form bonds, and overall behavior in chemical reactions. Additionally, atomic structure, such as atomic size and electronegativity, also influences chemical properties.
When moving down a group, the number of valence electrons do not change. This similarity yields the elements in the same groups to have same chemical properties. For example, elements in group 17 obtain one electron to stabilize as -1 ion.In a group, all the elements have a same number of valence electrons. So their chemical properties are equal. But the physical properties vary.Valence electrons are the electrons in outermost shell.The valence electrons remain same in a group. For example-Group-1 elements have 1 valence electron.
Elements in the same column on the periodic table have similar chemical reactivity because they have the same outer electron configuration and it is the electron structure that determines an elements properties.
Elements in the same period have the same number of electron shells. They exhibit similarities in atomic size because they have the same number of electron shells, but their chemical properties vary due to differences in the number of valence electrons.
Elements in the same group on the periodic table have similar chemical properties because they have the same number of valence electrons. This similarity in valence electron configuration influences how the elements react with other substances and their physical properties.
Elements that contain four valence electrons include elements from group 14 of the periodic table, such as carbon (C), silicon (Si), germanium (Ge), tin (Sn), and lead (Pb). These elements have their outermost electron shell filled with four electrons and display a variety of chemical properties based on this electron configuration.
Elements in the same group have similar properties because they have the same number of valence electrons. In contrast, elements in the same period do not necessarily have similar properties, as their chemical behavior is determined by the number of electron shells they have.
As you move across a period, elements have the same number of electron shells but different numbers of valence electrons. This leads to differences in reactivity and chemical properties across the period.
The number and arrangement of electrons determine how elements react chemically. Elements strive to achieve a stable electron configuration, such as a full outer electron shell, through gaining, losing, or sharing electrons with other elements. This determines an element's reactivity and chemical behavior.