OXIDATION NO/5
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| THE MELTING TEMP DECREASES DOWN GROUP COZ ... | IONIC RADIUS INCREASE SO ATTRACTION BETWEEN 2+ AND DELOCALISED ELECTRONS LESS.
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| ELECTRICAL CONDUCTIVITY: DELOCALISE ELECTRONS ARE .. | MOBILE CAN CARRY ELECTRIC POTENTIAL.
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| THERE’S IS BIG JUMP BETWEEN 2ND AND 3RD CONSECUTIVE I.E. OF ALL GROUP 2 ELEMENTS. COZ ... | 3RD ELECTRON REMOVES COMES FROM INNER ELECTRON SHELL.- MUCH CLOSER TO NUCLEUS SHIELDED.
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| FROM MG TO CA THE NUCLEAR CHARGE... | INCREASE BY 8 BUT THE INNER SHIELDING ELECTRONS INCREASE BY 8. SO SAME EFFECTIVE NUCLEAR CHARGE. DIFFERENCE IS THAT ELECTRON IN CA IS IN 4S SO FURTHER AWAY & 3S IN THE MAGNESIUM.
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| IN SAME PERIOD 1ST I.E. ENERGIES OF GROUP 2 METAL LARGER THAN GROUP 1 – COZ... | EFFECTIVE NUCLEAR CHARGE INCREASES APPROXIMATELY FROM 1 TO 2 & GROUP 2 ATOM HAS SMALLER RADIUS THAN GROUP 1.
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| REACTIONS OF GROUP 2 METALS | IN ALL COMPOUND GROUP 2 METALS IN +2 OXIDATION STATE.,
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| REACTIVITY IN GRP 2... | INCREASE DOWN GROUP COZ EASIER TO REMOVE 2 OUTER ELECTRONS.
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| GROUP 2 METALS BURN IN AIR TO FORM... | IONIC OXIDES OF --. 2CA + O2 2CAO
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| WHAT ARE MG ,CA,SR,BA,LI FLAME COLOURS... | MAGNESIUM –WITH INTENSE WHITE LIGHT. CALCIUM BURNS WITH RED FLAME, STRONTIUM BURNS WITH DARK RED FLAME (CRIMSON). BARIUM BURNS WITH PALE GREEN FLAME.LITHIUM – RED
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| BERYLLIUM DOESN’T REACT ... | WITH WATER.
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| MG REACTS SLOWLY WITH ... | COLD WATER TO PRODUCE AN ALKALINE SUSPENSION OF MGOH AND HYDROGEN GAS. MG + 2H20(L) MG (OH)2 + H2.
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| WHEN HEATED WITH STEAM THE MG ... | BURNS MAKING MGO AND HYDROGEN GAS MG + H2O(G) MGO + H2
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| CA, SR AND BARIUM REACT RAPIDLY WITH ... | COLD WATER =
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| CA, SR AND BARIUM MAKE ... | METAL HYDROXIDES AND BUBBLES OF HYDROGEN GAS.
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| DO GROUP 2 METAL REACT WITH CHLORIEN ? | YES ,CA + CL2 CACL2.
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| WHEN BERRYLIUM REACTED WITH CL FORMS .. | AN ANHYDROUS CHLORIDE.
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| APART FROM BERYLLIUM CHLORIDE THE CHLORIDES ... | DISSOLVE IN WATER TO PRODUCE MGCL2(S) + AQ [MG(H2O)6]2+(AQ) +2CL-(AQ).
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| THE SIX WATER MOLECULES ARE COVALENTLY BONDED BY ... | THE LONE PAIR OF ELECTRONS ON THE OXYGEN TO THE CENTRAL METAL ION. SHAPE IS OCTAHEDRAL COZ METAL ION SURROUNDED BY 6 BOND PAIR AND NO LONE PAIRS.
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| WHY ARE HYDRATED COMPOUNDS OCTAHEDRAL ... | COZ METAL ION SURROUNDED BY 6 BOND PAIR AND NO LONE PAIRS. HEXAAQUAMAGNESIUM ION IS DISPROTONATED BY SOLVENT WATER MOLECULE E.G. .....
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| WHEN DISPROTONATED BY SOLVENT WATER SOLUTION BECOMES ... | SLIGHTLY ACIDIC
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| GROUP 2 OXIDES AND OH ARE.. | BASES FORMULA MO AND M(OH)2.
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| DOES BEO DISSOLVE IN WATER ... | YES
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| DOES MGO DISSOLVE IN WATER WHAT IS FORMED?.. | MGO REACTS SLOWLY/, INCOMPLETELY TO FORM ALKALINE OF MAGNESIUM HYDROXIDE.
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| DOES CAO CALLED QUICKLIME REACT WITH WATER. | . YES IT REACTS EXOTHERMICALLY WITH H2O TO FORM ALKALINE OF CA(OH)2.
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| WHAT ARE SOLID/SOLUTIONS CAOH CALLED ... | SLAKE LIME AND SOLUTIONS CALLED LIME WATER.
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