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Group 1 has the greatest  metallic character and group 17 has the lowest metallic character

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the ionization energy decreases as the size of the atom gets larger

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The most metallic element is francium. However francium is a man-made element , except for one isolate and all isotopes are so radioactive they almost instantly decay into another element. The natural element with the highest metallic character is cesium which is found directly above francium on the periodic table

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also referred to as the ionization potentia and is measured in volts.

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a chemical element, expressed in joules or electron volts, is usually measured in an electric discharge tube in which a fast-moving electron generated by an electric current collides with a gaseous atom of the element, causing it to eject one of its electrons.

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The way its measured could also be called Metallic Radius, or Covalent Radius.

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For many purposes, atoms can be modeled as spheres. This is only a crude approximation, but it can provide quantitative explanations and predictions for many phenomena

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Metallic character describes the set of chemical properties that are associated with the elements classified as metals in the period table. Metallic character depends on the ability of an element to lose its outer valence electrons.

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Go down in the P-Table the atoms get bigger, and as you go across to the right, it gets smaller

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Electronegativity, measures the tendency of an atom to attract a shared pair of electrons (or electron density). An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.

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the minimum amount of energy required to remove the most loosely bound electron of an isolated neutral gaseous atom or molecule.

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It is measured by finding the distance from the nucleus of one atom and the nucleus of another.

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A measure of the size of atoms.

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The electronic attraction between the nucleus and the electrons

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The electronic attraction between the nucleus and the electrons