Question

please help me to g the answers . I want some explain or example type answers.
thnx​

Answer 1

ELEMENTS WITH SAME VALENCY HAVE SIMILAR PROPERTIES

HYDROGEN IS FIRST ELEMENT.

THESE ALL ARE ALSO KNOWN AS ALKALI METALS.

2.

a. CHLORINE

B. LITHIUM

The following are the advantages of Modern Periodic table.

1. All elements are fundamentally arranged according to their atomic number. So it becomes easy to understand and compare their properties, thereby making it easier to remember the position of the elements

2. The position of the elements in the periodic table makes it easy to predict and compare their properties, and explains the reason for their specific position in the periodic table.

3. It gives explanation for the periodicity of elements and tells the reason why all elements in a group having similar properties, which differ between the gropus and periods.

4. Positions of isotopes are taken care of within th elemen itself, unlike in Mendeleev periodic table.

5. In the Modern periodic table, the metals, non-metals, transition metals, gases are separately placed in a specific location with a specific identity.

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