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प्रश्न
An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a compound.
(a) Write the position of these elements in the modern periodic table.
(b) Write the formula of the compound formed.
Justify your answer in each case.
उत्तर
(a) Element X (atomic number 17) belongs to p-block. Period 3, Group 17.
Electronic configuration of X: 2, 8, 7
Valence shell electrons = 7
So, Group number = 17
Period to which the elements belongs = 3
Element Y (atomic number 20) belongs to s-block. Period 4, Group 2.
Electronic configuration of Y:2, 8, 8, 2
Valence shell electrons = 2
So, Group number = 2
Period to which the belongs = 4
(b) X has 7 valence electrons so, it needs 1 more electron to complete its octet and Y has 2 valence electrons so it will give its 2 electrons to acquire octet configuration. Hence X will gain 1 electron and Y will lose 2 electrons, so the chemical reaction is:
X2 + Y → YX2
Specifically, X = Cl and Y = Ca
So, Cl2 + Ca → CaCl2
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संबंधित प्रश्न
State whether the following statement is true of false:
The elements in a group have consecutive atomic numbers.
The element which forms a basis oxide has the atomic number of:
(a) 18
(b) 17
(c) 14
(d) 19
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An atom of an element has the electronic configuration 2,8,2. To which group does it belong?
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Relate the names of the following scientists with the statements given below.
Arranged elements into groups containing three elements each.
Relate the names of the following scientists with the statements given below.
Arranged elements in a group of seven with increasing atomic masses and eighth elements with similar properties kept below the first like eight note in an act of music.
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Complete the following table:
| Symbol | Atomic No | Electronic Configuration | |
| 1. | He | 2 | ______ |
| 2. | Ne | ______ | 2,8 |
| 3. | Ar | ______ | 2, 8,8 |
| 4. | Na | 11 | ______ |
