Arsenic is a metalloid. Discoverer: Marinsky, Jacob A. and Coryell, Charles D. and Glendenin, Lawerence. Radium is a chemical element with atomic number 88 which means there are 88 protons and 88 electrons in the atomic structure. It is also the most corrosion-resistant metal, even at temperatures as high as 2000 °C. Therefore we have (still incorrect) 1s22s22p63s23p63d44s2, Correct Electron Configuration for Chromium (Cr). Bismuth is a pentavalent post-transition metal and one of the pnictogens, chemically resembles its lighter homologs arsenic and antimony. All rights reserved. The chemical symbol for Selenium is Se. Elemental sulfur is a bright yellow crystalline solid at room temperature. Technetium is the lightest element whose isotopes are all radioactive; none are stable. Lawrencium is the final member of the actinide series. Correct Electron Configuration for Chromium (Cr)

Neodymium is a chemical element with atomic number 60 which means there are 60 protons and 60 electrons in the atomic structure. The chemical symbol for Technetium is Tc.

Note that when writing the electron configuration for an atom like Cr, the 3d is usually written before the 4s. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure. Information about your device and internet connection, including your IP address, Browsing and search activity while using Verizon Media websites and apps. The chemical symbol for Protactinium is Pa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. Since the 3s if now full we'll move to the 3p where we'll place the next six electrons. Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). 2) You may not distribute or commercially exploit the content, especially on another website. This give us the (correct) configuration of: For the Cr2+ ion we remove one electron from 4s1 and one from the 3d5 leaving us with:

Discoverer: Corson, Dale R. and Mackenzie, K. R. The actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. Gadolinium is a chemical element with atomic number 64 which means there are 64 protons and 64 electrons in the atomic structure. The chemical symbol for Aluminum is Al. The chemical symbol for Nitrogen is N. Nitrogen is a colourless, odourless unreactive gas that forms about 78% of the earth’s atmosphere.

Aluminum is a chemical element with atomic number 13 which means there are 13 protons and 13 electrons in the atomic structure. Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic.

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