Question

12. How are the elements arranged in the Modern Periodic
Table? Compare Modern Periodic Law with Mendeleev's
Periodic Law.
13. How could the Modern Periodic Table remove various
anomalies of Mendeleev's Periodic Table?

15. What is meant in the Periodic Table by the terms:
(a) group, and
(b) period?​

Answer 1

Answer:

Mendeleev's periodic table is, based on relation of properties of elements as dependent on the atomic weight of element. But Modern periodic table considers atomic number as the fundamental property that decides the properties of elements. ... These elements atomic number shows the reverse order compared to atomic mass.

13.The Modern Periodic Table could remove various anomalies of Mendeleev's Periodic Table: a) In the Modern Periodic table elements are arranged in the increasing order of their atomic number, removing the anomaly regarding certain pairs of elements in Mendeleev's periodic table.

15.A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. ... A group is a vertical column of the periodic table, based on the organization of the outer shell electrons. There are a total of 18 groups

Answer 2

Explanation:

12 .. Mendeleev's periodic table is, based on relation of properties of elements as dependent on the atomic weight of element. But Modern periodic table considers atomic number as the fundamental property that decides the properties of elements. ... These elements atomic number shows the reverse order compared to atomic mass.

13. The Modern Periodic Table could remove various anomalies of Mendeleev's Periodic Table: a) In the Modern Periodic table elements are arranged in the increasing order of their atomic number, removing the anomaly regarding certain pairs of elements in Mendeleev's periodic table.

15.. A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. ... A group is a vertical column of the periodic table, based on the organization of the outer shell electrons. There are a total of 18 groups