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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.
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संबंधित प्रश्न
Give two example of group 17 elements.
State whether the following statement is true or false:
On going down in a group of the periodic table, the number of valence electrons increases.
State how the valency of elements varies in a group of the periodic table?
Name two elements in each case:
Actinides
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Give the symbol and valency of the following element and radical.
Sulphate
State the number of elements in Period 1 of the Periodic Table.
______ is the longest period in the periodical table.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Write the molecular formula of the compound formed by the combination:
E and B
