Solution : The Anomalous behaviour of second-period elements Second-period elements show anomalous behaviour due toi) small size,ii) high electronegativity,iii) absence of d-orbitals andiv) they form pπ−pπ bonds and pπ−dπ bonds, but do not form a dπ−dπ bond..
Solution : The general outer electronic configuration of s, p, d and f block elements : – The general outer electronic configuration of s block elements is ns (1−2) .The general outer electronic configuration of p block elements is ns 2 np (1−6) .The general outer electronic configuration of d block elements is (n−1)d(1−10) ns …
Write the general outer electronic configuration of s, p, d and f block elements. Read More »
Solution : Liquid metal at Room temperature is Mercury (Hg) having a melting point of −38.83 0 C. The Latin name of Mercury is hydrargyrum. Mercury is also known as quicksilver.
Solution : . Those elements exhibit some properties of both metals and non-metals., these elements are called metalloids or semi-metals. In the Modern Periodic Table, a zig-zag line separates metals from non-metals. The borderline elements – boron, silicon, germanium, arsenic, antimony, tellurium and polonium – are intermediate in properties and are called metalloids or semi-metals.
Metallic and Non-metallic Properties Trends in the Modern Periodic Table The variation of metallic and nonmetallic properties along the period and along the group: Moving from left to right across a period in the periodic table results in a decrease in metallic character. This happens because atoms are more willing to accept electrons in order …
Metallic and Non-metallic Properties Trends in the Modern Periodic Table Read More »
Valency trend in Modern Periodic Table The valency trend Moving from the left to the right side of a period increases the number of valence electrons. The number of valence electrons stays constant within a group, even with this periodic trend.
Solution : Atomic Size Atomic size is the distance between the centre of the nucleus of an atom and its outermost shell. or, The shortest distance between the atom’s nuclei and the outermost shell of the atom. Atomic Radius The shortest distance between an atom’s nucleus and its outermost shell is known as the atomic …
THE MODERN PERIODIC TABLE In 1913, Henry Moseley showed that the atomic number (symbolised as Z) of an element is a more fundamental property than its atomic mass.Accordingly, Mendeléev’s Periodic Law was modified and atomic number was adopted as the basis of Modern Periodic Table and the Modern Periodic Law can be stated as follows:‘Properties …
MAKING ORDER OUT OF CHAOS – THE MODERN
PERIODIC TABLE Read More »
MENDELÉEV’S PERIODIC TABLE Dmitri Ivanovich Mendeléev, a Russian chemist. He was the most important contributor to the early development of a Periodic Table of elements wherein the elements were arranged on the basis of their fundamental property, theatomic mass, and also on the similarity of chemical properties. When Mendeléev started his work, 63 elements were …
MENDELÉEV’S PERIODIC TABLE and its advantages and disadvantages. Read More »
Dmitri lvanovich Mendeléev (1834-1907) Dmitri lvanovich Mendeléev was born in Tobolsk in Western Siberia,Russia on 8 February 1834. After his early education, Mendeléevcould join a university only due to the efforts of his mother. Dedicating his investigations to his mother he wrote, “She instructed with example, corrected with love and travelled with me to places …
