Question

more than 78% of all known elements are

Answer 1

Answer:

Metals

Explanation:

Left side of periodic table

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Answer 2

Answer:

Concept:

Approximately 80% of the elements are metals (shiny elements that conduct heat and electricity well) and 15% are non-metals (poor conductors of heat and electricity).

Explanation:

Selenium is a chemical element with the atomic number 34 and the symbol Se. It is not made of metal. The level of reactivity of a metal is referred to as its metallic character. Metals, as evidenced by their low ionization energies, tend to lose electrons in chemical reactions. Metal atoms within a compound have a relatively low attraction for electrons, as evidenced by their low electronegativities.

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