You are watching: What force holds ionic compounds together
The substances explained in the preceding discussion are written of molecule that space electrically neutral; the is, the number of positively-charged protons in the cell nucleus is equal to the variety of negatively-charged electrons. In contrast, ions space atoms or assemblies of atom that have actually a net electrical charge. Ions that contain under electrons 보다 protons have a net confident charge and also are called cations. Conversely, ion that contain more electrons than protons have actually a net an unfavorable charge and are dubbed anions. Ionic compounds save on computer both cations and anions in a ratio that results in no net electric charge.
In covalent compounds, electrons are shared in between bonded atoms and also are simultaneously attracted to much more than one nucleus. In contrast, ionic compounds save on computer cations and anions quite than discrete neutral molecules. Ionic compound are hosted together by the attractive electrostatic interactions between cations and also anions. In an ionic compound, the cations and anions space arranged in room to type an prolonged three-dimensional selection that maximizes the number of attractive electrostatic interactions and minimizes the variety of repulsive electrostatic interaction (Figure (PageIndex1)). As shown in Equation ( efEq1), the electrostatic power of the interaction in between two fee particles is proportional come the product of the charges on the particles and also inversely proportional to the distance between them:
< ext electrostatic energy propto Q_1Q_2 over r labelEq1>
where (Q_1) and (Q_2) room the electric charges on particles 1 and also 2, and also (r) is the distance between them. As soon as (Q_1) and also (Q_2) space both positive, equivalent to the dues on cations, the cations repel each other and also the electrostatic energy is positive. When (Q_1) and also (Q_2) room both negative, matching to the dues on anions, the anions repel each other and the electrostatic power is again positive. The electrostatic energy is an adverse only as soon as the charges have actually opposite signs; the is, positive charged varieties are attractive to negatively charged species and vice versa.
If the electrostatic energy is positive, the particles repel each other; if the electrostatic energy is negative, the particles space attracted to each other.
One example of an ionic compound is salt chloride (NaCl; number (PageIndex3)), developed from sodium and also chlorine. In developing barisalcity.orgical compounds, many elements have a tendency to get or lose enough electrons to obtain the same variety of electrons together the noble gas closest to them in the periodic table. Once sodium and also chlorine come into contact, each sodium atom offers up one electron to end up being a Na+ ion, through 11 proton in that nucleus yet only 10 electrons (like neon), and also each chlorine atom gains an electron to come to be a Cl− ion, through 17 proton in the nucleus and 18 electrons (like argon), as displayed in component (b) in number (PageIndex1). Solid sodium chloride consists of equal number of cations (Na+) and also anions (Cl−), therefore maintaining electric neutrality. Every Na+ ion is surrounding by 6 Cl− ions, and also each Cl− ion is surrounded by 6 Na+ ions. Due to the fact that of the huge number that attractive Na+Cl− interactions, the full attractive electrostatic power in NaCl is great.
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Consistent with a propensity to have the same variety of electrons together the nearest noble gas, when forming ions, elements in teams 1, 2, and also 3 have tendency to shed one, two, and also three electrons, respectively, to type cations, such as Na+ and also Mg2+. Lock then have actually the same number of electrons together the nearest noble gas: neon. Similarly, K+, Ca2+, and also Sc3+ have actually 18 electron each, prefer the nearest noble gas: argon. In addition, the aspects in group 13 lose three electrons to kind cations, such as Al3+, again attaining the same variety of electrons as the noble gas closest to them in the periodic table. Because the lanthanides and also actinides formally belong to group 3, the most common ion created by these aspects is M3+, whereby M to represent the metal. Conversely, elements in groups 17, 16, and 15 frequently react to get one, two, and three electrons, respectively, to kind ions such as Cl−, S2−, and also P3−. Ion such together these, i beg your pardon contain just a single atom, are referred to as monatomic ions. The fees of most monatomic ions acquired from the main group facets can be predicted by just looking in ~ the regular table and counting how plenty of columns an facet lies indigenous the too much left or right. For example, barium (in team 2) develops Ba2+ to have the same variety of electrons as its nearest noble gas, xenon; oxygen (in team 16) forms O2− to have actually the same variety of electrons together neon; and cesium (in team 1) develops Cs+, which has the same variety of electrons as xenon. Keep in mind that this method is ineffective for many of the change metals. Some common monatomic ions are provided in Table (PageIndex1).
|Li+ lithium||Be2+ beryllium||N3− nitride (azide)||O2− oxide||F− fluoride|
|Na+ sodium||Mg2+ magnesium||Al3+ aluminum||P3− phosphide||S2− sulfide||Cl− chloride|
|K+ potassium||Ca2+ calcium||Sc3+ scandium||Ga3+ gallium||As3− arsenide||Se2− selenide||Br− bromide|
|Rb+ rubidium||Sr2+ strontium||Y3+ yttrium||In3+ indium||Te2− telluride||I− iodide|
|Cs+ cesium||Ba2+ barium||La3+ lanthanum|
Ions that Atoms: https://youtu.be/mh71O8g40Kc