Lanthanides
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The Lanthanide - Toppr
WEBlanthanides. Lanthanoids, also called lanthanides are 15 consecutive chemical elements in the periodic table from lanthanum to lutetium (atomic numbers 57–71). With scandium and yttrium, they make up the rare-earth metals. Their atoms have similar configurations and similar physical and chemical behaviour; the most common valencies are 3.
Toppr.comLanthanides are:14 elements in the sixth period (atomic no
WEBThe elements in which the additional electrons enters (n-2)f orbitals are called innertransition elements. 4f-block elements are also called lanthanides or rare earths so lanthanides are 14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4 f …
Toppr.comDefine lanthanoid contraction. Explain its effects. - Toppr
WEBExplain its effects. Lanthanoid contraction: The gradual decrease in atomic and ionic radii of lanthanoids with the increase in atomic number is called lanthanoid contraction. It has a definite effect on the properties of lanthanoids. (i) In lanthanoids due to lanthanoid contraction, as the atomic number increases, the size of the lanthanoid
Toppr.comDiscuss the consequences of lanthanide contraction. - Toppr
WEBHowever, due to imperfect shielding, the effective nuclear charge increases causing a contraction in electron cloud of 4f -subshell. Consequences of lanthanide contraction: (i) Basicity of ions: Due to lanthanide contraction, the size of Ln3+ ions decreases regularly with increase in atomic number. According to Fajan's rule, decrease in size of
Toppr.comLanthanoids used in glass blower's goggles are - Toppr
WEBP m and S m. Solution. Verified by Toppr. Correct option is A. P r and N d. lanthanides have been widely used as alloys to impart strength and hardness to metals. The main lanthanides used in glass, blowers and goggles are Pr and Nd. Was this answer helpful?
Toppr.comGive reason :Separation of a mixture of Lanthanoid elements is
WEBSeparation of a mixture of Lanthanoid elements is difficult. Solution. Verified by Toppr. Separation of a mixture of Lanthanoid elements is difficult because, 1) Due to Lanthanoid contraction, the size difference is less. 2) Due to similarities in chemical properties. Was this answer helpful?
Toppr.comLanthanides and actinides resemble in: - Toppr
WEBStatement 1: lanthanides have much less tendency to form complexes than actinides. Statement 2: Compared to actinides, the lanthanides have relatively larger size of atoms and less nuclear charge.
Toppr.comWrite the uses of Lanthanides. - Toppr
WEB4. lanthanides are used in metallothermic reactions due to their extraordinary reducing property. Lanthanido-thermic processes can yield sufficiently pure Nb, Zr, Fe, Co, Ni, Mn, Y, W, U, B and Si. 5. Alloys of lanthanides are known as mish-metals. The major constituents of mish-metals are Ce(45−50%), La(25%),N d(5%) and small quantities of
Toppr.comOnly lanthanide which is radioactive is: SnYbPmEu - Toppr
WEBSolution. Verified by Toppr. Only lanthanide which is radioactive is P m (Promethium).
Toppr.comHow are lanthanides extracted from monazite sand? - Toppr
WEBThe method used for the extraction of lanthanides from monazite sand consists of the steps which have been shown in flowsheet. Individual lanthanides are separated by a suitable physical method. The anhydrous fluorides and chlorides are heated under argon atmosphere in presence of calcium at 1270 K to get the individual metal. The pure metal …
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