The 5th group metals remarks about their general chemical properties and reactivity

3 The 5th group metals remarks about their general chemical properties and reactivity 

The elements of this group are in many aspects similar to those of group 4. 

They react, at high temperature, with most non-metals often forming non-stoichiometric and interstitial derivatives. They are generally resistant to corrosion mainly due to the formation of surface films of oxides. 

Vanadium. It is stable in air below 250°C. After long exposition it becomes bluish grey to brownish black significant oxidation takes place at about 300°C. Vanadium reacts with hot concentrate mineral acids, especially HN03 and HF. It has good corrosion resistance towards molten low melting metals, especially alkali metals. 

Niobium and tantalum. Their chemistries are similar although not as nearly identical as for Zr and Hf. However, this similarity can be highlighted and, in this case too, related to the effect of the lanthanide contraction. 

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