Question

What is meant by periodicity ? How do the following properties change in a group and period explain . a) Atomic radius b) Electron affinity c) Ionisation energy d) electro negativity e) Valency




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Answer 1

Answer:

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.