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  2. en.wikipedia.org › wiki › NonmetalNonmetal - Wikipedia

    2 days ago · Some consider metalloids distinct from both metals and nonmetals, while others classify them as nonmetals. Some categorize certain metalloids as metals (e.g., arsenic and antimony due to their similarities to heavy metals ).

  3. 2 days ago · It's a nonmetal, more rarely considered a metalloid, with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium. Selenium is found in several forms, but most commonly as a gray metallic-looking form. Selenium was discovered in 1817 by Swedish chemist Jöns Jacob Berzelius.

  4. 4 days ago · This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to describe, compare, and explain the physical and chemical properties of metals, nonmetals, and metalloids.

  5. en.wikipedia.org › wiki › SeleniumSelenium - Wikipedia

    1 day ago · It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. It seldom occurs in its elemental state or as pure ore compounds in Earth's crust.

    • grey metallic-looking, red, and vitreous black (not pictured) allotropes
    • group 16 (chalcogens)
    • 34
  6. Properties and examples of metals and non metals Learn with flashcards, games, and more — for free.

  7. en.wikipedia.org › wiki › TelluriumTellurium - Wikipedia

    2 days ago · edit. | references. Tellurium is a chemical element; it has symbol Te and atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid. Tellurium is chemically related to selenium and sulfur, all three of which are chalcogens. It is occasionally found in its native form as elemental crystals.

  8. 5 days ago · Answer. Verified. 321.6k + views. Hint: All elements (except hydrogen) which form a positive ion by losing electrons within a chemical reaction are known as metals whereas the elements which have a tendency to gain electrons and form anions within a chemical reaction are known as nonmetals.

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