The cation Hf4+.
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Hafnium can react with a variety of elements to form compounds, such as oxygen to form hafnium dioxide (HfO2) or with chlorine to form hafnium tetrachloride (HfCl4). It is generally considered to be unreactive at room temperature but can react with strong acids and alkalis under high temperature conditions.
Hafnium is an element, not a compound. It is a transition metal with the atomic number 72 and symbol Hf.
Hafnium has 2 electrons in its first shell and 8 electrons in its second shell. Therefore, in the outer shell of hafnium, there are 2 + 8 = 10 valence electrons.
Hafnium-174 is the most common isotope of hafnium, making up about 31% of naturally occurring hafnium.
Metals form cations and non-metals form anions.