2nd Year Chemistry: PERIODICITY
2nd Year Chemistry:
is the energy required to remove an electron from an atom in the gas phase.
is tendency of an atom in a molecule to attract an electron.
atoms readily give up valence electrons and accumulate positive charge, known as
, and this tendency is known as
, energy released when an atom/ molecule gains an electron in gas phase to form a negative ion.
First scientist to published the clear and coincides arrangement of the elements according to their periodic similarities.
showed, that the position of an element depends upon its
According to periodic Law: "
properties of elements are the periodic functions of their atomic number
Representative elements / Typical elements
are call "
". A family has two blocks.
Representative elements are
metals, non-metal and metalloid.
1st and 2nd group
are called the
ALKALI or ALKALINE earth metals.
:check: Electro-positive in nature
. :check:Valence shell full, therefore nonreactive under ordinary conditions
are all metals. :check: form colored compounds, & have variable oxidation states
Outer Transition Elements
Inner Transition Elements
:check: In s and p blocks the
:red_flag:columns of elements are called groups
:check: In the s and p blocks,
:red_flag: rows are called period.
study of the chemical and physical properties of the elements.