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प्रश्न
Identify and name the metals out of the following elements whose electronic configurations are given below.
- 2, 8, 2
- 2, 8, 1
- 2, 8, 7
- 2, 1
उत्तर
Out of the given options, if the electronic configuration of a, b, c and d are considered, they represent the elements magnesium, sodium, chlorine and lithium respectively. Out of these elements magnesium, sodium and lithium are metals.
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संबंधित प्रश्न
An element X is in group 2 of the periodic table What will be the formula of its chloride?
An atom has the electron structure of 2, 7.
(a) What is the atomic number of this atom?
(b) To which of the following would it be chemically similar?
7N, 15P, 17Cl, 18Ar
(c) Why would you expect it to be similar?
Find the neutral atom in the periodic table which has the same number of electrons as K+ and Cl−. What is this number?
The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was ______.
If the distance between two Cl atoms in a Cl2 molecule is 1.98Å, then the radius of the Cl atom is ______.
Match the following
| 1. | Galvanisation | Noble gas elements |
| 2. | Calcination | Coating with Zn |
| 3. | Redox reaction | Silver-tin amalgam |
| 4. | Dental filling | Alumino thermic process |
| 5. | Group 18 elements | Heating in the absence of air |
What property forms the basis of identification?
Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.
Which of the following is a transition element?
The element with atomic number 26 will be found in group ______
