Element Properties: Identifying the Incorrect Match
The question requires identifying the incorrectly matched pair describing element properties. Let's examine each option:
Nitrogen's Electron Configuration
Nitrogen (N) has an atomic number of 7, with the electron configuration \(1s^2 2s^2 2p^3\). The \(2p\) subshell has three orbitals, each holding one electron. Thus, nitrogen has three unpaired electrons in its ground state. This match is correct.
Carbon's Valency
Carbon (C), with atomic number 6, has the electron configuration \(1s^2 2s^2 2p^2\). It commonly forms four covalent bonds, making it tetravalent. This match is correct.
Chlorine's Isotopes
Chlorine (Cl) exists with two major stable isotopes: Chlorine-35 (\(^{35}\)Cl) and Chlorine-37 (\(^{37}\)Cl). Therefore, it has two stable isotopic forms. This match is correct.
Helium's Molecular State
Helium (He) is a noble gas. Noble gases are known for their inertness and exist as individual atoms. They are monatomic gases, not diatomic (\(He_2\)). The statement 'Helium : Diatomic gas' is incorrect.
Incorrect Match Identified
The incorrectly matched pair is Helium, described as a diatomic gas.
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