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प्रश्न
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
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उत्तर
As we move from left to right in a period, the size decreases, therefore, it will be smaller than Cesium.
संबंधित प्रश्न
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
What are the groups in a periodic table? Give two characteristics of each.
Name two elements in halogens.
State the modern periodic law.
Give the symbol and valency of the following element and radical.
Magnesium
Give the chemical formula of magnesium nitrate
Find the odd one out and give its explanation.
Distinguish between:
Group 17 - Group 18
