Question

What is Periodic property? How do the following properties change in a period and in a group?
(a)Atomic radius
(b)Ionization potential and
(c)Electronegativity

Answer 1

The phenomenon in which repetition of similar properties of elements occurs or reappears at atomic number intervals of 2,8,8,18,18 ,32 is called periodicity and these properties are called periodic properties. These include atomic radii, Ionisation potential, Electronegativity,Electron affinity etc.

a) Atomic radius
1st and 2nd Image show varius types of Atomic radius types
3rd and 4th img. shows trends of Atomic radius in periodic table.

b) Ionization potential
See 5th and 6th Image. But sorry I can't upload other images

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Answer 2

the physical and chemical properties of elements in a Periodic Table are for periodic function of their atomic numbers is known as periodic property
atomic radius -in periods as we move from left to right of a period table that Atomic radius decreases
as the atomic number increases number of protons and electrons will increase which results in increase of nuclear charge and the atom gets shrink which results in decreace of atomic size
in groups
as we come down the groups the size of an atom increases
as a value of n increases the number of shells increases which results in the increase of atomic size
ionization potential - the amount of energy required to remove an electron from the outermost shell is known as ionisation energy or ionisation potential
in periods the ionisation potential will increase moving from left to right
in groups ionization potential decreases from top to bottom
electron negativity
in periods electronegativity will increases when moving from left to right
in groups electronegativity will decrease from top to bottom