chemistry - ionic and metallic bonding

paper is to be continued

what is Ionic bonding?

strong electrostatic attraction between oppositely charged ions

desscribe the bonding in platinum

metal cation in a sea of delacalised electrons. metallic bonding is the strong electrostatic attraction between cations and electrons

describe the bonding in the element chromium and use your answer to justify why it has such a high melting point

• regular arrangement of positive ions

• sea of delocalised electrons

• strong forces of attraction between ions and delocalised electrons

• lots of energy is needed to break attraction between ions and delocalised electrons (metallic bonds)

state all conditions under which magnesium bromide conducts electricity

molten and dissolved in water (aqueous)

explain why the electrocal conductivity of solid potassium bromide is poor but an aqueous solution of potassium bromide is a good electrical conductor

• ions are in a fixed positions (not free to move)

• it does conduct in solution because ions are free to move and carry charge

what is the electronic structure of a magnesium atom

1s² 2s²2p⁶3s²

the bonding in magnesium results from…

strong electrostatic attractions between positively charged ions and a sea of delocalised electrons

what is the equation for the ionic compound of sodium and fluorine

2Na (s) + F₂ —> 2NaF

why are sodium and fluorine ioselectronic

ions have the same electronic configuration

give the formula of a stable ION that is isoelectronic with the magnesium ion Mg²⁺

N^3- O^2- F^- Na⁺ Al³⁺

what’s the equation, including state symbols, for the thermal decomposition of calcium carbonate?

CaCO₃(s) → CaO(s) + CO₂(g)

what are all the bonds present in calcium carbonate?

ionic and covalent

in terms of bonding, why is a high decomposition temperature is require to break calcium carbonate

strong bonds within the carbonate ion