#### Question

The first (Δ_{1}H_{1}) and the second (Δ_{1}H_{2}) ionization enthalpies (in kJ mol^{-1}) and the (Δ_{eg}H) electron gain enthalpy (in kJ mol^{-1}) of a few elements are given below:

Elements | Δ_{1}H_{1} |
Δ_{1}H_{2} |
Δ_{eg}H |

I | 520 | 7300 | -60 |

II | 419 | 3051 | -48 |

III | 1681 | 3374 | -328 |

IV | 1008 | 1846 | -295 |

V | 2372 | 5251 | +48 |

VI | 738 | 1451 | -40 |

Which of the above elements is likely to be the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?

#### Solution

Element V has the highest first ionization energy and high second ionization energy. Therefore, it can form a predominantly stable covalent halide of the formula MX (X=halogen).

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Solution The First (δ1h1) and the Second (δ1h2) Ionization Enthalpies (In Kj Mol-1) and the (δEgh) Electron Gain Enthalpy (In Kj Mol-1) of a Few Elements Which of the Above Elements is Likely to Be the Metal Which Can Form a Predominantly Stable Covalent Halide of the Formula Mx (X=Halogen)? Concept: Periodic Trends and Chemical Reactivity.