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प्रश्न
Which element has twice as many electrons in its second shell as in its first shell?
Name the element which has twice as many electrons in its second shell as in its first shell?
उत्तर १
Carbon
उत्तर २
Carbon is an element with twice as many electrons in its second shell as in its first shell. Its atomic number is 6, and its electronic configuration is 2, 4.
Electronic configuration:-
| Shells | K | L |
| Electrons arranged | 2 | 4 |
Notes
Students should refer to the answer according to their questions.
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संबंधित प्रश्न
Name the element which is in seventeenth group and second period.
How does the tendency to lose electrons change as we go down in group 1 of the periodic table? Why does it change this way?
Which of the following is the valence shell for the elements of second period of the modern periodic table?
(a) M shell
(b) K shell
(c) L shell
(d) N shell
In each of the following pair, choose the atom having the bigger size:
Na (At. No. 11) or K (At. No. 19)
Name two elements you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
An element X belong to 4th period and 17th group, state.
name the family to which it belong.
Complete the following sentences.
The properties of the elements are a periodic function of their …………… (atomic number, mass number, reative atomic mass).
name the elements in period 1.
Write two reasons responsible for late discovery of noble gases ?
An element 'M' has atomic number 12.
(a) Write its electronic configuration.
(b) State the group to which 'M' belongs.
(c) Is 'M' a metal or a non-metal.
(d) Write the formula of its chloride.
On the basis of electronic configuration, how will you identify the first and the last element of a period?
'In a group, the atomic radii increase with increasing period number', explain this statement and justify it with reference to group 17.
Select the correct answer
Number of shells in potassium are
State the number of elements in period 1, period 2 and period 3 of the periodic table.
An element belongs to the third period and Group IIIA (13) of the periodic table. State: if it is a metal or non-metal?
State the property trends in general of elements on moving down in a group of the periodic table.
Name or state following with reference to the elements of the first three periods of the periodic table.
The number of electron shells in elements of period 1, period 2, and period 3.
Name or state following with reference to the element of the first three periods of the periodic table.
The non-metallic element present in period 3 other than sulphur and chlorine.
Name or state following with reference to the element of the first three periods of the periodic table.
The valency of the element in period 3 having atomic number 17.
Complete the table pertaining to the following elements given in Column I.
| Column I Elements | Atomic Number | Electronic Configuration | Underline the element present in that group |
| 1. Hydrogen | 1 | ______ | Be/Na/Ca |
| 2. Carbon | 6 | ______, ______ | N/P/Si |
| 3. Nitrogen | 7 | _______, ______ | C/P/S |
| 4. Oxygen | 8 | _______, ______ | N/S/Cl |
| 5. Sulphur | 16 | _____, ______, _______ | O/N/F |
| 6. Chlorine | 17 | _____, ______, ______ | I/O/S |
