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प्रश्न
An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.
- Which element has more metallic character from these two elements?
- What is the valency of each X and Y elements?
- Atom size of Y element is smaller than atom size of X element. Explain.
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उत्तर
- Element X has more metallic character than element Y.
- Valency:
Element X = 1
Element Y = 3
i. Both elements X and Y belong to the period 3.
ii. While going from left to right in a period, atomic number increases. So, positive charge on the nucleus increases. At the same time, electrons get added in the same outermost shell.
iii. This increases effective nuclear charge. As a result, electrons are attracted closer to the nucleus decreasing the size of the atom.
iv. Thus, atomic radius goes on decreasing while going from left to right in a period. Hence, atom size of Y element is smaller than atom size of X element.
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संबंधित प्रश्न
In the Modern Periodic Table, which are the metals among the first ten elements?
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 basis for modern periodic table is ...............
What is meant by a period, in a periodic table?
How were the positions of isotopes of an element decided in the modern periodic table?
On which side of the periodic table will you find metals?
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
Which element has the electronic configuration 2, 8, 2?
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.
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(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
Name the scientist who stated the modern periodic law.
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Transition element
Name the type of elements which have outermost shell incomplete.
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Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Give the symbol and valency of the following element and radical.
Bicarbonate
Give the symbol and valency of the following element and radical.
Nitrate
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Find the odd one out and give its explanation.
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Write an Explanation.
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| Mg, | Ca, | K, | Ge, | Ga |
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| 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:
A and F
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Define periods of modern periodic table.
Select the appropriate options and complete the following paragraph:
(metals, non-metals, metalloids, four, seven, s-block, p-block, d-block, f-block).
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What is the general name of the last elements of the Periodic Table?
