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- https://chem.libretexts.org/Bookshelves/General_Chemistry/Map%3A_Structure_and_Properties_(Tro)/01%3A_Atoms/1.08%3A_Subatomic_Particles_-_Protons_Neutrons_and_ElectronsTo date, about 118 different elements have been discovered; by definition, each is chemically unique. To understand why they are unique, you need to understand the structure of the atom (the fundament...To date, about 118 different elements have been discovered; by definition, each is chemically unique. To understand why they are unique, you need to understand the structure of the atom (the fundamental, individual particle of an element) and the characteristics of its components. Atoms consist of electrons, protons, and neutrons. Although this is an oversimplification that ignores the other subatomic particles that have been discovered, it is sufficient for discussion of chemical principles.
- https://chem.libretexts.org/Ancillary_Materials/Exemplars_and_Case_Studies/Exemplars/Culture/History_of_the_Periodic_TableSeaborg suggested a change to the table in the form of an addition of the actinide and lanthanide series at the bottom of the table. * Mendeleev used the name ''eka''boron because the blank space into...Seaborg suggested a change to the table in the form of an addition of the actinide and lanthanide series at the bottom of the table. * Mendeleev used the name ''eka''boron because the blank space into which the element should fit was ''below'' boron in his periodic table. † The modern value of the atomic weight of scandium is 44.96.
- https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Supplemental_Modules_and_Websites_(Inorganic_Chemistry)/Descriptive_Chemistry/Elements_Organized_by_Block/2_p-Block_Elements/Group_13%3A_The_Boron_Family/1Group_13%3A_General_Properties_and_ReactionsThe boron family contains the semi-metal boron (B) and metals aluminum (Al), gallium (Ga), indium (In), and thallium (Tl).
- https://chem.libretexts.org/Courses/can/CHEM_210%3A_General_Chemistry_I_(An_Atoms_Up_Approach)/06%3A_Periodic_Law_and_Periodic_Properties_of_the_Elements/6.01%3A_The_Development_of_The_Periodic_TableSeaborg suggested a change to the table in the form of an addition of the actinide and lanthanide series at the bottom of the table. * Mendeleev used the name ''eka''boron because the blank space into...Seaborg suggested a change to the table in the form of an addition of the actinide and lanthanide series at the bottom of the table. * Mendeleev used the name ''eka''boron because the blank space into which the element should fit was ''below'' boron in his periodic table. † The modern value of the atomic weight of scandium is 44.96.
- https://chem.libretexts.org/Courses/Westminster_College/CHE_180_-_Inorganic_Chemistry/14%3A_Chapter_14_-_p-Block_Elements/14.1%3A_Group_13/Physical_Properties_of_Group_13The boron family contains the semi-metal boron (B) and metals aluminum (Al), gallium (Ga), indium (In), and thallium (Tl).
- https://chem.libretexts.org/Courses/Bennington_College/Chemistry_-_An_Integrated_Approach_(Bullock)/03%3A_Why_Do_Molecules_Exist/3.02%3A_Atomic_Structure[8] The radius of a “typical” atom is on the order of about 1×10 -10 m, whereas that of the nucleus is about 1×10 -15 m; using this proportion, if an atom were the size of a football field, 100 yards ...[8] The radius of a “typical” atom is on the order of about 1×10 -10 m, whereas that of the nucleus is about 1×10 -15 m; using this proportion, if an atom were the size of a football field, 100 yards across, the nucleus would be like a dime sitting on the 50-yard line; the rest of the surrounding stadium would be the electron cloud.
