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Nafudakake (名札掛け, lit. "name-plate-rack") is a Japanese method of displaying all the names of the members in a group by collecting the names on individual plaques called nafuda (名札, "nametag") and hanging them together in a specialized case called kake (掛け, "rack").
Group 3 is the first group of transition metals in the periodic table. This group is closely related to the rare-earth elements. It contains the four elements scandium (Sc), yttrium (Y), lutetium (Lu), and lawrencium (Lr). The group is also called the scandium group or scandium family after its lightest member.
The first transition series is present in the 4th period, and starts after Ca (Z = 20) of group 2 with the configuration [Ar]4s 2, or scandium (Sc), the first element of group 3 with atomic number Z = 21 and configuration [Ar]4s 2 3d 1, depending on the definition used. As we move from left to right, electrons are added to the same d subshell ...
See also Group 3 element#Composition. d Group 18, the noble gases, were not discovered at the time of Mendeleev's original table. Later (1902), Mendeleev accepted the evidence for their existence, and they could be placed in a new "group 0", consistently and without breaking the periodic table principle. r Group name as recommended by IUPAC.
Stencilled in white, max 4 inches high, front and back of the vehicle, groupings were separated by a one-inch dash. Groups three and four may be on the opposite end of the bumper. If put into two lines, Group 1 was over Group 2, and Group 3 over Group 4. A trailer would carry the same bumper number of its towing vehicle. [4]: 12 M3 medium tank ...
See also Group 3 element#Composition. d Group 18, the noble gases, were not discovered at the time of Mendeleev's original table. Later (1902), Mendeleev accepted the evidence for their existence, and they could be placed in a new "group 0", consistently and without breaking the periodic table principle. r Group name as recommended by IUPAC.