Metals conduct electricity.
Metals ionise [lose one or more electrons] to form positively charged ions - cations.
They have high ionization energy and high electronegativity.
The most of the chemical elements are metals. Most are transition metals (located in the middle of the Periodic Table).
Nonmetals lack most of the properties of a metal.
Their properties are similar with non-metals and metals. That's why they're called semi-metals. They are reactive depending on the element they are reacting with, and they are semi-conductors.
The most important step taken by Mendeleev in developing the periodic table of elements was the realization that chemical properties come in a repeating pattern, as elements get heavier. They go from metals to nonmetals to noble gases, and then back to metals.
They have high ionization energy and high electronegativity.
Examples: resistance to corrosion, valence, Pauling electronegativity.
The chemical properties of calcium are most similar to (in between) the chemical properties of magnesium and strontium.
Density
The most of the chemical elements are metals. Most are transition metals (located in the middle of the Periodic Table).
These properties are: luster, malleability, ductility, conductivity, hardness, resilience, elasticity, shear modulus, etc.
Nonmetals lack most of the properties of a metal.
Yes, chemical properties can be determined only experimentally, as a consequence of chemical reactions. But, today chemists can made some predictions about chemical properties of a substance on the basis of existing data about chemical and physical properties.
There is NOT such an element:All elements have an unique, some more, some less different set of chemical properties, though there are some metals resambling each other more than most of the nonmetals, like oxygen, nitrogen, chlorine, ... etc.
The most of the chemical elements are metals. Most are transition metals (located in the middle of the Periodic Table).
The most of the chemical elements are metals. Most are transition metals (located in the middle of the Periodic Table).
Most metals. Non-metals usually do NOT have both these properties.