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प्रश्न
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].
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उत्तर
Valency of elements in group [I–A] is +1
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संबंधित प्रश्न
Name the element that has two shells, both of which are completely filled with electrons.
Calculate the mass of Calcium that will contain the same number of the atom as are present in 3.2 gm of Sulphur.
[Atomic masses: S=32, Ca=40]
The element which has the maximum number of valence electrons is:
(a) Na
(b) P
(c) Si
(d) A
Why are noble gases placed in a separate group?
How does the number of:
valence electrons and
Choose the most appropriate answer from the following list of oxides which fit the description.
An oxide which dissolves in water forming an acid.
Arrange the following as per instruction given in the bracket.
Cs, Na, Li, K, Rb (decreasing electronegativity)
Going across a period left to right, atomic size _____.
The position of certain elements in the Modern Periodic Table is shown below:
| Group → Period ↓ |
1 | 2 | 3 to 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 1 | G | H | |||||||
| 2 | A | I | B | C | |||||
| 3 | D | E | F |
Using the above table answer the following questions giving reasons in each case:
- Which element will form only covalent compounds?
- Which element is a non-metal with valency 2?
- Which element is a metal with valency 2?
- Out of H, C, and F which has the largest atomic size?
- To which family does H, C, and F belong?
State the following:
The group which contains highly electropositive metals including sodium.
