Question

1. Lanthanides and actinides are kept separately in the modern periodic table. Why?

2. Differentiate between long period and short period in any two points.

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Answer 1

1.. Lanthanides and actinides are kept separately in the modern periodic table Why?

Lanthanides and actinides are kept separately in the modern periodic table because of following reason:

• If they are placed in the body of the periodic table, the periodic table will become extremely long and hard to recognize
• more scientific and technical reason why they chose to keep the lanthanides and actinides away from the rest of the periodic table was to help in the grouping of elements in blocks

Step-by-step explanation:

2. Differentiate between long period and short period in any two points.

Long period:

• The 4th and 5th periods of the periodic table are called long periods.
• The long periods coontain 18 elements in them

short period:

• The 2nd and 3rd periods of the periodic table are called short periods.
• The short periods contain 8 elements in them