Which lanthanoid compound is used as a most powerful liquid lasers after dissolving it in selenium oxychloride?
Cerium oxide
Neodymium oxide
Promethium sulphate
Ceric sulphate
Related Questions
The trivalent ion having largest size in lanthanide series is
Ti
Zr
Hf
La
Which of these is an INCORRECT observation about alkali metals?
Are generally soft.
Have shiny surfaces when freshly cut.
Exhibit characteristic flame colors.
Produce a violet flame when heated.
Which of the following statements concerning the lanthanide elements is INCORRECT?
They readily form +3 ions.
They are chemically inert, similar to noble gases.
Their properties show some variations across the series.
Except promethium, they are not radioactive.
Which element has the electronic configuration ?
Eu
Gd
Tb
Dy
Which element is the exception to the generally non-radioactive nature of lanthanides?
Cerium (Ce)
Promethium (Pm)
Europium (Eu)
Gadolinium (Gd)
-level is successively filled up in:
Lanthanoids
Actinoids
Rare gases
Transition elements
The most common oxidation state of lanthanides is:
+2
+3
+4
+5
Which actinide element is primarily used as fuel in nuclear reactors?
Thorium
Uranium
Plutonium
Americium
The reason for greater range of oxidation states in actinoids is attributed to
levels being close in energies
The radioactive nature of actinoids
Actinoid contraction
levels having comparable energies
The electronic configuration of an element is [Xe] 4f7 5d1 6s2. Identify the element and its position in the periodic table.
Europium, period 6, group 2, lanthanide series
Terbium, period 6, group 4, lanthanide series
Gadolinium, period 6, group 3, lanthanide series
Dysprosium, period 6, group 5, lanthanide series
