Chemistry
State the reasons for periodicity of elements in periods and groups.
Periodic Table
53 Likes
Answer
Reasons for Periodicity in properties in periods and groups is as follows —
- After definite intervals of atomic number, similar valence shell electronic configuration occurs i.e., same number of electrons are present in the outermost orbit of the elements.
- Properties of elements depend upon the number and arrangement of electrons in various shells including valence shells.
- In the same period or sub-group, increase or decrease in a particular property is due to gradual change in electronic configuration in the arranged elements.
Answered By
32 Likes
Related Questions
Give reasons for the following:
Atomic size of an element depends on the nuclear charge of that element.
Give reasons for the following:
Down a group electronegativity should increase with increase in nuclear charge but it is seen that the electronegativity decreases.
Give reasons for the following:
If combining atoms have nearly similar electronegativities the bond between them is covalent.
Arrange the following elements as per the guidelines in brackets.
- Na, Cl, Mg, P [in decreasing order of atomic size]
- C, Li, F, N [in increasing order of electronegativity]
- Cl, Al, Na, S [in increasing order of ionization potential]
- Li, F, C, O [in increasing order of electron affinity]
- Ar, He, Ne [in increasing order of number of electron shells]