P-1 Periodic Classification of Element — Science STD 10 — Question

(i) The Modern Periodic table contains seven horizontal rows called the periods 1 to 7.
(ii) Similarly, the eighteen vertical columns are the groups 1 to 18.
(iii) The arrangement of the periods and groups results into formation of boxes.
(iv) Atomic numbers are serially indicated in the upper part of these boxes.
(v) Each box corresponds to the place for one element.
(vi) Apart from these seven rows, two rows are shown separately at the bottom of the periodic table.
(vii) These are called Lanthanide series and Actinide series respectively.
(viii) There are 118 boxes in the periodic table including the two series.
(ix) It means that there are 118 places for elements in the Modern Periodic table.
(x) The Modern Periodic table is now completely filled means all the 118 elements are now discovered.
(xi) The entire periodic table is divided into four blocks, viz, s-block, p-block, d-block and f-block.
(xii) The s-block contains the groups 1 and 2 elements.
(xiii) The groups 13 to 18 constitute the p-block elements.
(xiv) The groups 3 to 12 constitute the d-block elements. The d-block elements are called transition elements.
(xv) The lanthanide and actinide series at the bottom form the f-block elements.
(xvi) A zig-zag line can be drawn in the p-block of the periodic table.
(xvii) The metalloid elements lie along the border of this zig-zag line.
(xviii) All the metals lie on the left side of the zig-zag line, while all the non-metals lie on the right side.