What is the characteristic of Rare Earth Elements?
Their three outermost shells are incomplete.
Rare earth elements (lanthanides and actinides) are characterised by the successive filling of the inner 4f (or 5f) sub-shells, while the 5d/6s (or 6d/7s) sub-shells are also partially occupied. As a result, three outermost shells (n, n−1 and n−2 for the f-block) remain incomplete in terms of their sub-shells. Hence the correct answer is option 2.
Similar Questions
The element with the symbol K is:
Which of the following pairs is correctly matched?
Which of the following element symbols does NOT match its element?
Which of the following statements is/are true?
A. Out of 114 elements, 32 are non-metals and others are metals.
B. Every ore is a mineral but every mineral is not an ore.Which of the following is NOT a feature of Mendeleev's periodic classification?
Which elements were named by Mendeleev by adding the prefix 'Eka' before the name of the preceding element in the same group?
In Mendeleev's periodic table, the horizontal rows are called:
Group ____ contain non-reactive gases.
The chemical properties of the element having which of the following atomic numbers are similar to magnesium?
The modern periodic table has:
Important Questions from Periodic Table
The correct order of decreasing electron gain enthalpy with negative sign for chalcogens is - Identify
Modern periodic table has:
Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics?
‘Triclosan’, considered harmful when exposed to high levels for a long time, is most likely present in which of the following?
____________ is also known as Quick lime.
