FW: Modern Periodic Table
Kale D.P.
AJINKYA KALE
-----Original Message-----
From: my...@googlegroups.com [mailto:my...@googlegroups.com] On Behalf Of
myssc support
Sent: Tuesday, December 01, 2009 12:11 PM
To: mySSC
Subject: Modern Periodic Table
The modern periodic law states that - Properties of the elements are a
periodic function of their atomic numbers
i.e. the number of protons (in the nucleus) or the number of extra
nuclear electrons present in the neutral atoms of elements.
The modern periodic table, also known as the long form or the extended
form of the periodic table, is based on the concept of atomic number.
. In this table, the elements are arranged in the order of increasing
automic numbers (Z).
. There are seven horizontal rows called periods and eighteen vertical
columns. There are two additional rows called series placed seperately
at the bottom of the table.
. According to one method of group numbering, the eighteen columns are
numbered as sixteen groups (IA-VIIA,VIII,IB-VIIB and zero).According
to second method of group numbering, the eighteen columns are numbered
as eighteen groups (1-18).
. The entire table is divided into four blocks, named as s-block, p-
block, d-block and f-block.
. Elements belonging to a particular group show strong resemblance in
their chemical properties like valency, formulae of compounds and
chemical reactions. Elements show gradual variation in chemical
properties along a period.
Group IA : family of Alkali metals (excluding Hydrogen)
. Elements - Li, Na, K , Rb, Cs, Fr
. Monovalent
. Chlorides - LiCl, NaCl, KCl
. Oxides - Li2O, Na2O, K2O
. All the Alkali metals react with water to form their Hydroxides and
release Hydrogen gas.
Group IIA : family of Alkaline earth metals
. Elements - Be, Mg, Ca, Sr, Ba, Ra
. Divalent
. Chlorides - BeCl2, MgCl2, CaCl2
. Oxides - BeO, MgO, CaO
. Carbonates - BeCO3, MgCO3, CaCO3
. All the Alkaline earth metals lose CO2 on heating and form the
corresponding Alkaline earth metal.
Group VIIA : family of Halogens
. Elements - F, Cl, Br, I, At
. Monovalent
. Compounds with hydrogen HF, HCl, HBr
. Compounds with Alkalimetals NaCl, NaBr, KI
. Compounds with Alkaline earth metas BeCl2, MgCl2, MgBr2, CaCl2
. Physical state under ordinary conditions
o Fluorine Chlorine - Gases
o Bromine - Liquid
o Iodine, Astantine - Solid
Group 0 : Noble gases / Rare gases
. Elements - He, Ne, Ar, Kr, Xe, Rn.
. Valency 0
The inert gases have stable electronic configuration with complete
duplet or complete octet. Hence atoms of inert gases form neither
ionic nor covalent bonds with other atoms.
Block - Group - Electronic configuration - Type of Element
s-block - IA, IIA, Hydrogen (1,2) - 1 or 2 electrons in outermost
shell - Normal Elements
p-block - IIIA to VIIA and Zero (13 to 17) - 3 to 8 electrons in
outermost shell - Normal Elements(Except zero group elements)
d-block - IIIB to VIIB and VIII (3 to 12) - last two shells
incompletely filled - Transition elements
f-block - lanthanides and actinides - last three shells incompletely
filled - Inner transition elements
myssc support
mySSC.in offers solutions to various questions under the feature 'Ask
Expert'. However, this facility is available only for members of
myssc.in and only for the requests submitted through the site
myssc.in. Hence it is not necessary that mySSC support will answer all
the questions on this forum. Group members are welcome to post
articles and to proceed the discussions.
>
> - Show quoted text -