Practice free Classification of elements and Periodicity in properties (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following is not a metal?
(d) It belongs to VI A gp. and all the elements are non-metals, except Po of this gp.
The ions O2-, F-, Na+, Mg2+ and Al3+ are isoelectronic. Their ionic radii show [2003]
The ionic radii of isoelectronic ions (ions with the same number of electrons) show a significant decrease from O2- to Al3+. This is because as the nuclear charge increases from O2- to Al3+, the electrons are more tightly bound to the nucleus, resulting in a smaller ionic radius.
The example of metalloid elements in the periodic table is:
(c) B and Si both have intermediate properties between metals and non-metals.
The element with atomic number 26 is:
(c) Iron (Fe) has atomic number 26.
The alkali metals have:
(b) Atomic radius decrease along the period.
The telluric helix was given by:
The telluric helix was proposed by Alexandre-Emile Béguyer de Chancourtois in 1862. He arranged the elements in a spiral on a cylinder with elements having similar properties lining up vertically.
The element with atomic number 30 is expected to be present in:
(d) According to its electronic configuration.
The correct order of acid strength is:
(a) Higher is the oxidation number of non-metal, more is acidic nature. higher the electro -vety ,higher will be acidic.
Which is called a bridge element?
Magnesium (Mg) is considered a bridge element as it exhibits properties of both s-block and p-block elements. It has properties intermediate between the highly reactive alkaline earth metals and the more electropositive elements of the p-block.
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?
[2005]
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