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प्रश्न
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.
उत्तर
Atomic number of ‘M’ = 12
(i) Electronic configuration : 2, 8, 2
(ii) Since, the valence shell contains 2 electron, it belongs to group 2.
(iii) M is a metal.
(iv) The formula of its chloride is M Cl2.
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संबंधित प्रश्न
The position of eight elements in the Modern Periodic Table is given below where atomic numbers of elements are given in the parenthesis.
| Period No. | ||
| 2 | Li(3) | Be(4) |
| 3 | Na(11) | Mg(12) |
| 4 | K(19) | Ca(20) |
| 5 | Rb(37) | Sr(38) |
(i) Write the electronic configuration of Ca.
(ii) Predict the number of valence electrons in Rb.
(iii) What is the number of shells in Sr?
(iv) Predict whether K is a metal or a non – metal.
(v) Which one of these elements has the largest atom in size?
(vi) Arrange Be, Ca, Mg and Rb in the increasing order of the size of their respective atoms.
How does the number of valence electrons vary on moving from left or right in the second period of the periodic table?
Arrange the following elements in the increasing order of their metallic character:
Mg, Ca, K, Ga
An element X belong to 4th period and 17th group, state.
name of the element.
Arrange the following as per instruction given in the bracket.
K, Pb, Ca, Zn (increasing reactivity)
Element P has atomic number 19. To which group and period, does P belong? Is it a metal or a non-metal? Why?
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.
The electronic configuration of an element is 2, 8, 4. State it:
name and write its one physical property.
Based on the group valency of element write the molecular formula of the following compound giving justification:
Compound formed when an element A of group 2 combines with an element B of group seventeen.
Name or state following with reference to the element of the first three periods of the periodic table.
The valency of elements in group 1 [I–A].
