Question

Explain the Structure of modern periodic table with the help of following points: (a) State the Number of Rows and Columns in Modern Periodic Table (b) Total Number of elements discovered. (1) (c) Name the groups included in p-block. Ε Ε (d) Name the block which includes lanthanide and actinide series. (e) d-block elements are also called as? (1) OR (a) What is a solenoid? D (b) Compare the magnetic field produced by a solenoid with the magnetic field of a bar magnet. (C) Draw a neat labelled diagram of a solenoid with magnetic lines of force​

Answer 1

Answer:

(a) no of rows is 7 and no of coloumns is 18

Answer 2

Answer:

A) There are eighteen vertical columns known as groups in the modern periodic table which are arranged from left to right and seven horizontal rows which are known as periods.

B) Of the 118 elements that have been discovered, there are 90 elements that occur in nature in appreciable amounts. Depending who you ask, there are another 4 or 8 elements that occur in nature as a result of radioactive decay of heavier elements. So, the grand total of natural elements is 94 or 98.

Explanation:

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