Question

state modern periodic law??
why noble gases have zero electron gain enthalpy??

Answer 1

the law that the properties of the elements are periodic functions of their atomic numbers. 2. Also called Mendeleev's law. (originally) the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights.

Noble gases have zero electron gain enthalpy because they contain all paired electrons and there is no place to accept another electron. All the orbitals are completely filled in them. So, they can't accept an electron and so the enthalpy is zero.

Answer 2

The law that the properties of elements are periodic
functions of their atomic numbers .also called Mendeleev's low .(originally) the statment that the chemical ad physical properties of elements recur periodically when the elements are arranged in order of theri atmoic weight.

☆ nobal gas have zero gain electrone enthalpy becoz
they contain all paired electrone ad there is no place to accept to another electrone .
all orbits are completely filled in them so,they can not accept electrone ad so the enthalpy is zero.

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