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Chem U7

Ionic Bonding

QuestionAnswer
what happens to the electrons in ionic bonding electrons are exchanged
octet rule electrons will be lost or gained to fill the highest level with 8 electrons
which element is an exception of the octet rule and why hydrogen; its orbital only fills up to 2 electrons at most
valence e- the e- found in the highest (outer) energy levels; responsible for bonding
true or false: an atom has a fixed radius false
what is the length of the atomic radius? 1/2 the distance between the nuclei of joined atoms
what happens to cations and anions when losing an electron? cations get smaller, anions get larger (needs to be more negative charge to make up for the loss of the e- and balance the cations?)
what happens to the size of the atoms when there are more electrons? same charges repel=more repulsion in the atom; e- push away and the atom size expands
(+ ?): the lewis dot structure follows which rule? Hund's rule; each orbital is singly occupied before doubly occupied. Always remember: e- are LAZY
electrostatic forces the attraction btwn positive and negative charges
salt an ionic compound
what does the electrostatic force do? it holds the elctrons on an atom and holds cations and anions together
Properties of ionic bonds crystal patterns as solids, hard&brittle, can conduct electricity when dissolved in water
give a description of metallic bonds cations with their valence electrons floating in btwn them
why does an ionic bond compound break when dropped but a metallic bond not break when dropped (at an angle?) ionics have a pattern of orderly alternating positive and negative atoms; metallics do not have an orderly arrangement of positives and negatives
properties of metallic bonds crystalline structure, conduct electricity, malleable, ductile, shiny, can form alloys
alloy mixtures of 2 or more metals (corrosion resistant, hard, tough) -properties of the mixture are superior to those of the component elements
ionic radius changes size depending on if it gains or loses electrons
ionic compound have a high or low melting pt? high (>500F)
Created by: allyson.lee
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