Question

explain about modern periodic table and periods and groups

Answer 1

The modern periodic table of the elements contains 18 groups, or vertical columns. Elements in a group have similar chemical and physical properties because they have the same number of outer electrons.

Answer 2

✔️✔️The modern periodic table is divided into 4 blocks

➖s-block

➖p-block

➖d-block

➖f-block

✔️✔️s- Block Elements

⭕️Group 1 (alkali metals) − 1 electron in outermost shell

⭕️Group 2 (alkaline earth metals) − 2 electrons in outermost shell

⭕️Alkali metals form +1 ion and alkaline earth metals form +2 ion.

⭕️Reactivity increases as we move down the group.

✔️✔️p - Block Elements

⭕️Elements belonging to Groups 13 to 18

⭕️Outermost shell contains 3 to 8 electrons respectively.

⭕️Group 18 − noble gases

⭕️Group 17 − halogen

⭕️Group 16 − chalcogens

✔️✔️d- Block Elements (Transition Elements)

⭕️Elements of group 3 to group 12

⭕️Called transition elements

⭕️Zn, Cd, and Hg do not show properties of transition elements.

✔️✔️f- Block Elements

⭕️They are called Lanthanoids and Actinoids

⭕️They are called inner-transition elements.

⭕️All are metals.

✔️✔️There are 18 groups in the periodic table.

✔️✔️Periods 6 each containing 32 elements.