PERIODICITY
mind map
- Created by: kadheeja4
- Created on: 13-07-13 09:41
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- periodicity
- atomic radii
- down a GROUP INCREASES
- energy levels increase ,electrons increase
- across a PERIOD DECREASES
- no. of electrons are added into the same energy level
- high effective nuclear charge (more protons)strong force of attraction
- no. of electrons are added into the same energy level
- down a GROUP INCREASES
- ionic radii
- Anions(-ve ion ) larger than atoms
- electron-electron repulsion elctrons >protons ,protons cannot pull the electrons tightly
- Cations(+ve ion)smaller than atoms
- protons>electrons, can pull the electrons tightly
- Anions(-ve ion ) larger than atoms
- First ionization energy
- energy neede to remove the outermost electrons from 1mol of gaseous atoms to produce 1mol of 1+gaseous ions.
- down a GROUP DECREASES easy to remove the outermost electron no attraction.
- across a PERIOD INCREASES strong attraction dificult to remove electrons.
- energy neede to remove the outermost electrons from 1mol of gaseous atoms to produce 1mol of 1+gaseous ions.
- second and higher ionization energy
- energy needed to remove an electron from +1 gasesous ions t produce +2 gaseous ions
- Electron affinity
- energy given off when a neutral atom in a gaseous phase gains an electron to form a -vely charged ion
- down a GROUP DECREASES
- across a PERIOD INCREASES
- energy given off when a neutral atom in a gaseous phase gains an electron to form a -vely charged ion
- atomic radii
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