How does the highest oxidation state change from titanium to manganese?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — transition metal Modern version of the periodic table of the elements (printable).

From titanium to manganese, the highest oxidation state exhibited by these elements corresponds to the total number of their 3d and 4s electrons. As you move across this series, the highest oxidation state increases incrementally:1

Titanium: +41
Vanadium: +52
Chromium: +613
Manganese: +71

While the maximum oxidation state increases from +4 to +7 across these elements, the stability of these highest states decreases as you progress from titanium to manganese. These high oxidation states are typically found only in fluorides, chlorides, or oxo compounds, and the resulting compounds often act as powerful oxidizing agents.1