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प्रश्न
How do you calculate the possible valency of an element from the electronic configuration of its atoms?
उत्तर
The electrons present in the last shell determine the valency of a particular element.
If, Number of valence electrons ≤4: valency = number of valence electrons Number of valence electrons >4: valency = 8 - number of valence electrons
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संबंधित प्रश्न
Elements in the same group show the same valency. Give scientific reason.
Consider two elements 'X' (Atomic number 17) and 'Y' (Atomic number 20)
(i) Write the positions of these elements in the modern periodic table giving justification.
(ii) Write the formula of the compound formed by the combination of 'X' and 'Y'.
(iii) Draw the electron-dot structure of the compound formed and state the nature of the bond formed between the two elements ?
Why do elements in the same group show similar properties but the elements in different groups show different properties?
Chorine in the periodic table is surrounded by the elements with atomic number 9, 16, 18 and 35.
Which of these have physical and chemical properties resembling chlorine.
The position of elements A, B, C, D and E in the periodic table are shown below:
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Group 1 |
Group 2 |
Group 17 |
Group 18 |
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D |
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B |
C |
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|
A |
|
|
E |
State which is metals, non-metals, and noble gas in this table.
State the nature of compounds formed when group 17 elements combine with (i) metals (ii) non-metals.
Answer the following question:
State the four blocks of the modern periodic table based on the electronic configuration of elements.
Write the electronic configuration of two elements A and B whose atomic numbers are 20 and 17 respectively. Write the molecular formula of the compound formed when element A reacts with element B. State whether this compound is acidic, basic or neutral. Give a reason to justify your answer.
Supply the missing word from those in bracket:
If an element has one electron in its outermost energy level [shell] then it is likely to be _______.
Name or state following with reference to the elements of the first three periods of the periodic table.
A metalloid in period 2 and in period 3.
