LECTURE 07 Ionic bonding

LECTURE 07 Ionic bonding - SUMMARY FROM LAST CLASS Periodic...

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Dr. P. Lucas U of A MSE 110 Periodic Table SUMMARY FROM LAST CLASS Columns = Groups : Elements from the same group have similar electronic configuration, they have the same number of electrons on the outer shell n . This results in similar chemical and physical properties of elements from the same group. Rows = Periods : Elements along a period have outer electrons on the same shell n . The same trend in properties is repeated in each period as the outer shell n s n p is filled with electron. The ionization energy and electron affinity increase along a period because the attractive energy increase with the charge of the nucleus. Following the octet rule , atoms tend to complete their outer shell n s 2 n p 6 with eight electrons. This is achieved by either gaining or loosing electrons to form ions or sharing electrons in covalent bonds .
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Dr. P. Lucas U of A MSE 110 Atomic Radii The charge of the nucleus increase along a period and generate a stronger binding energy. THE PERIODIC TABLE Electrons on the outer shell n are more tightly bound by the greater nucleus charge. The atomic radii decrease along a period because the charge of the nucleus and binding energy increase while the electrons stay on the same shell.
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Dr. P. Lucas U of A MSE 110 Atomic vs Ionic Radii IONIC BONDING Cations have a smaller size than atoms because they drop to a lower outer shell n. Li:1s 2 2s 1 Æ Li + :1s 2 Anions have a larger size because additional electrons shield the nucleus charge and decrease the binding energy.
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Dr. P. Lucas U of A MSE 110 Electronegativity All atoms have a different electron affinity and ionization energy. IONIC BONDING
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LECTURE 07 Ionic bonding - SUMMARY FROM LAST CLASS Periodic...

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