Group I, Group VII and Group O Elements

Group I Elements aka The Alkali Metals – Some of their physical properties: Shiny, soft solids which can be cut by a blade Low melting points. Melting points decrease down the group Low densities. Densities increase down the group Good conductors of heat and electricity – Some of their chemical properties: Form +1 ions as they lose …

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The Periodic Table

The Periodic Table: – Shows elements arranged in increasing atomic numbers/ proton numbers– Has vertical columns called groups and horizontal rows called periods The group number of an element shows how many electrons there are in that particular element’s outermost shell (valence electrons).Eg. Sodium (Na) is in Group I and has 1 valence electron while chlorine (Cl), in …

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Metals and Non-Metals

– Ionization energy of an atom is the amount of energy needed to remove an electron from itself. – Electronegativity of an atom refers to its tendency to attract electrons. – Electron affinity of an atom refers to the amount of energy given out when an electron is added to a neutral atom to form a anion. …

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The Periodic Law

– The Periodic Law states that when elements are arranged according to their atomic numbers, their physical and chemical properties recur in a systematic and predictable way. – With more electrons (and electron shells), the atomic size of the elements increase down the group. – Elements in the same group: have similar properties (both physical …

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