You are watching: Why do elements in the same group have similar properties
Key PointsThe physical properties of elements depend in part on their valence electron configurations. Together this configuration continues to be the exact same within a group, physical properties tend to stay somewhat consistent.The most notable within-group changes in physical properties take place in teams 13, 14, and 15, whereby the elements at the height are non-metallic, if the aspects at the bottom room metals.The fads in boiling and melting points vary from group to group, based on the form of non-bonding interaction holding the atom together.
TermsductileCapable of gift pulled or stretched into thin cable by mechanical pressure without breaking.physical propertyAny residential or commercial property that is measurable who value defines a physical system’s state.malleableAble to be hammered right into thin sheets; capable of being expanded or shame by beating through a hammer or through the push of rollers.
In chemistry, a team is a vertical shaft in the routine table that the chemistry elements. There room 18 groups in the standard routine table, consisting of the d-block elements but not included the f-block elements. Each aspect within a team has similar physical or chemical properties since of the atom’s outermost electron shell (most chemistry properties are overcame by the orbital location of the outermost electron).
Common physical Properties
A physical home of a pure substance have the right to be defined as something that have the right to be observed without the identification of the substance changing. The observations usually covers some type of number measurement, although periodically there is a more qualitative (non-numerical) summary of the property. Physical properties incorporate such points as:ColorBrittlenessMalleabilityDuctilityElectrical conductivityDensityMagnetismHardnessAtomic numberSpecific heatHeat of vaporizationHeat that fusionCrystalline configurationMelting temperatureBoiling temperatureHeat conductivityVapor pressureTendency to dissolve in miscellaneous liquids
These are just a couple of of the measurable physical properties.
Within a team of the routine table, each element has the very same valence electron configuration. For example, lithium, sodium, potassium, rubidium, cesium, and also francium all have actually a single electron in an s orbital, conversely, every aspect in the team including fluorine has the valence electron construction ns2np5, where n is the period. This means the elements of a group frequently exhibit comparable chemical reactivity, and there may be similarity in physics properties together well.
Boiling and also Melting Points
Before a conversation of the melt points of miscellaneous elements, it need to be listed that some aspects exist in different forms. For example, pure carbon deserve to exist as diamond, which has a really high melting point, or as graphite, whose melting allude is tho high however much lower than that of diamond.
Different groups exhibit different trends in boiling and melting points. For teams 1 and 2, the boiling and melting points decrease as you relocate down the group. Because that the shift metals, boiling and melting point out mostly increase as you relocate down the group, but they decrease for the zinc family. In the main group elements, the boron and carbon families (Groups 13 and 14) diminish in your boiling and also melting points as you move down the group, conversely, the nitrogen, oxygen, and also fluorine families (Groups 15, 16, and 17) often tend to increase in both. The noble gases (Group 18) diminish in your boiling and also melting points down the group.
These phenomena deserve to be interpreted in relationship to the types of pressures holding the facets together. Because that metallic species, the metallic bonding communication (electron-sharing) i do not care more complicated as the facets get larger (toward the bottom of the table), bring about the pressures holding them with each other to come to be weaker. As you move right follow me the table, however, polarizability and van der Waals interactions predominate, and also as bigger atoms are more polarizable, they tend to exhibit more powerful intermolecular forces and also therefore higher melting and also boiling points.
Metallic aspects are shiny, commonly gray or silver in color, and conductive of heat and also electricity. They are malleable (can be hammered right into thin sheets) and also ductile (can be stretched right into wires). Some metals, such as sodium, space soft and also can be cut with a knife. Others, such together iron, are really hard. Non-metallic atoms room dull and also are negative conductors. They space brittle once solid, and many room gases in ~ STP (standard temperature and also pressure). Metals give away your valence electrons as soon as bonding, conversely, non-metals have tendency to take electrons.A metal and a non-MetalOn the left is sodium, a an extremely metallic aspect (ductile, malleable, conducts electricity). Top top the appropriate is sulfur, a really non-metallic element.
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Metallic character increases from best to left and also from peak to bottom top top the table. Non-metallic character adheres to the opposite pattern. This is due to the fact that of the various other trends: ionization energy, electron affinity, and electronegativity. Friend will notification a jagged line running v the routine table beginning between boron and aluminum – this is the separation in between metallic and non-metallic elements, with some elements close come the line exhibiting characteristics of each. The steels are toward the left and center of the regular table, in the s, d, and f blocks. Negative metals and also metalloids (somewhat metal, somewhat non-metal) space in the reduced left the the ns block. Non-metals are on the appropriate of the table.
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