You are watching: Why do elements in a group have similar properties
The repeating sequence of physical and chemical properties amongst the elements, as soon as they were provided in order of raising atomic mass, to be what resulted in the development of the regular Table that the Elements. Today\"s periodic Table is i ordered it in order of increasing variety of protons in the nuclei of...
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The repeating succession of physical and also chemical properties among the elements, as soon as they were detailed in bespeak of enhancing atomic mass, was what led to the creation of the periodic Table the the Elements. Today\"s routine Table is arranged in order of increasing variety of protons in the nuclei of the atom of the elements, with the facets aligned so that those with similar properties space in the very same column, or group. It is actually the electrons, not the protons, that give rise to the properties that repeat from period to period, but because a neutral atom has actually the same number of electrons together protons, listing the aspects by atom number works just fine.
We now know that electrons room arranged roughly the atom nucleus in a structured arrangement, and it is the outermost electrons, referred to as the valence electrons, that are mainly responsible for connecting with other atoms, and also thus are responsible for both physical and also chemical properties. Being really small, electron have far-reaching wave nature, so their behavior cannot it is in adequately represented by classic physics, however can be explained by quantum mechanics. The source is complex but says that electrons around a nucleus have the right to exist only in certain states determined by your quantum number n, l, and also m. This states have actually probability distribution in space that we visualize as shapes, called orbitals. At most two electrons with different values that a fourth quantum number, s, have the right to \"occupy\" the same shape, or orbital.
The rules for quantum states and the quantum numbers cause each principal energy level to have one spherical s orbital and also three dumbbell-shaped p orbitals. Because two electrons can occupy every orbital, these have the right to hold as much as eight electrons. It turns out that atoms are most stable once the s and also p orbitals in the exact same level space either all complete or all empty. If some, but not all, have actually one or two electrons, the atom is unstable and also will reaction with various other atoms, gaining, losing, or share electrons to acquire to the all-or-nothing arrangement.
The periodic Table is i ordered it so the members of the same group have the same variety of electrons in your outermost layer, called valence electrons. Thus every one of the group 1 facets have one electron in one s orbital. With the exception of hydrogen, they all lose that electron readily. Then that totality level is empty, and the level listed below it is fully filled. The propensity to shed their single valence electron provides the group 1 aspects their comparable properties. All of the group 18 aspects have the s and also p orbitals in their valence level all filled v two electrons each, eight total, for this reason they room stable and also tend no to react through anything. All of the team 17 elements are one brief of having totally filled valence s and p orbitals, so your interactions room all governed by the propensity to acquire one electron.
All that chemistry is administer by the instability of atom that have partially-filled \"valence shells,\" the name provided to the s and also p orbitals in the outermost layer. Depending how plenty of electrons one atom has, the will tend to different mechanisms to either finish or empty the set. Atoms having actually the exact same number will often tend to react the exact same way, and since facets having the same number are arranged in groups, teams tend to have actually the very same properties.
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This description applies most clearly to the \"main-group\" or A elements. The B facets or transition metals (Groups 3-12) have one or two valence electrons and a varying number of inner electron in \"inner\" d and f orbitals. The properties of change metals are comparable to one one more (because that their comparable arrangement of valence electrons) and are commonly not included in discussions of periodic properties.