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Atomic number - is the number of protons in the nucleus, which with a neutral atom is also the number of electrons.

In a Periodic Table the elements have the atomic number on them.

Answer:

(Info credit goes to "Info on Element Mn" link)

Manganese - MnAtomic number 25

Atomic Mass 54.9380 g.mol -1

Electronegativity according to Pauling 1.5

Density 7.43 g.cm-3 at 20°C

Melting point 1247 °C

Boiling point 2061 °C

Vanderwaals radius 0.126 nm

Ionic radius 0.08 nm (+2) ; 0.046 nm (+7)

Isotopes 7

Electronic shell [ Ar ] 3d5 4s2

Energy of first ionisation 716 kJ.mol -1

Energy of second ionisation 1489 kJ.mol -1

Standard potential - 1.05 V ( Mn2+/ Mn )

Discovered Johann Gahn in 1774

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