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प्रश्न
The following questions refer to the Periodic Table.
Name the first and last element in period 2.
उत्तर
First element in period 2 is Lithium and last element is Neon.
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संबंधित प्रश्न
The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.
- Calculate the average atomic mass of elements A and C.
- Compare the average atomic mass with atomic mass of B.
- What could the elements A, B and C be?
An element Z has atomic number 16. Answer the following questions on Z:
1) State the period and group to which Z belongs
2) Is Z a metal or a non-metal?
3) State the formula between Z and hydrogen
4) What kind of a compound is this?
In terms of electronic configurations, explain the variation in the size of the atoms of the elements belonging to the same period and same group ?
Where would you locate the element with electronic configuration 2, 8 in the modern periodic table?
Why sodium element of group 1 and chlorine element of group 17 both have valency 1?
How does the number of:
valence electrons and
The elements of one short period of the periodic table are given below in order from left to right:
| Li | Be | B | C | O | F | Ne |
To which period do these elements belong?
Name and state the following with reference to the elements of the first three periods of the periodic table.
Valency of elements in Group 14 and 15.
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.
Electron Affinity is maximum in ______.
