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Periodicity
AQA A Level Chemistry
| Question | Answer |
|---|---|
| What is periodicity | Patterns that recur at regular intervals |
| Why do we group elements in the periodic table? | Because they have similar properties |
| In what order are the elements of the periodic table arranged? | Increasing atomic number |
| Which groups can be classed as s block? | Gp 1+2 |
| Which group can be classed as d block? | Transition metals |
| Which groups can be classed as p block? | groups 3-7+0 |
| Which group can be clased as f block? | lanthanides |
| How do you determine whether an element is in an s,p,d/f block? | Depending on which subshell electrons are being added to |
| Which energy level are the outer electronsin, in period 3 elements? | 3rd |
| Why is sodium described as an s block element? | It is in the s block because the last orbitals to be filled are s orbitals. |
| In which block are the transition metals? | d block |
| Which groups are in the s block? | groups 1 and 2 |
| Define first ionisation energy | The removal of 1 mol of electrons from 1 mol of gaseous atoms. |
| Write the equation to show the first ionisation of lithium | Li₍g₎ →Li⁺₍g₎ + e⁻ |
| What is the general trend of ionisation energy across period 2? | It increases |
| Why does first ionisation energy generally increase across period 2? | Greater attraction between nucleus and outer electrons |
| Why are the first ionisation energies of period 3 lower than those of p2 ? | electrons further away and shielded |
| Why is there a drop in first ionisation energy between Be and B? | The electrons have started to fill p orbitals which are further away from the nucleus |
| Why is there a drop in first ionisation energy between Mg and Al? | The electrons have started to fill p orbitals which are further away from the nucleus |
| Why is there a drop in first ionisation energy between N and O? | electrons have started to pair in p orbitals. Electron is repulsed by the other electron making it easier to remove. |
| Why is there a drop in first ionisation energy between P and S? | electrons have started to pair in p orbitals. Electron is repulsed by the other electron making it easier to remove. |
Created by:
JBearfield
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