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A series of elements in the periodic-table, generally considered to range in proton number from cerium (58) to lutetium (71) inclusive. The lanthanoids all have two outer s-electrons (a 6s2 configuration), follow lanthanum, and are classified together because an increasing proton number corresponds to increase in number of 4f electrons. In fact, the 4f and 5d levels are close in energy and the filling is not smooth
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How many electron does gallium need for its outershell to be full?
Five electrons. Gallium has an electronic configuration of [Ar] 4s2 3d10 4p1 The outer shell can be considered full when it is the same as the noble gas in the same period, Krypton, which has the configuration [Ar] 3d10 4s2 4p6
What are the lanthanides placed on the perioic table?
Lanthanoids are placed down in the periodic table.They contain elements with atomic number 57 to 71.There are total 15 elements in lanthanoids group.
What does the number of electrons on the outershell of an atom tell us?
The valence of the element
How man electrons are in the outershell of sodium?
Sodium has 1 valence electron.
What is the goup of promethium?
Promethium is a member of the lanthanoids family.
What group is terbium in?
The term group is not adequate for lanthanoids.
What group is at the bottom of the periodic table?
lanthanoids and actenoids
Is actinides a rare earth series?
Actinoids is series of chemical elements; lanthanoids is an other different series.
How many electons does an oxygen atom have in its outershell?
Six in the outer (2nd) shell
Rows on a periodic table?
7 + 2 for the lanthanoids and actinoids.
What faimly is promethium?
Promethium is a member of the lanthanoids family.
What group is shown at the bottom of the periodic table?
lanthanoids and actenoids
