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in the same way as sodium/potassium forms an ion.

Lithium has an electron configuration of 2,1

Sodium has an electron configuration of 2,8,1,

Potassium has an electron configuration of 2,8,8,1

Rubidium has an electron configuration of 2,8,8,18,1

Caesium has the electron configuration of 2,8,8,18,18,1

Notice in all cases the last number is '1'. This represents the outer most electron, shell with one electron. Since it is the outer most electron and is shielded by energy shells of electrons from the nucleus, this outer most electron is not strongly held to the atom. The atom readily releases this outermost electron , and the process is called ionisation.

Chemically it is represented by the formula

M(g) = M^+(g) + e^-

NB

'M' is an ATOM

'M^+' is an ION (Not an atom).

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lenpollock

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1y ago

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