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प्रश्न
Name or state following with reference to the element of the first three periods of the periodic table.
A non-metal in period 2 which is tetravalent.
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उत्तर
Tetravalent non-metal is carbon [C]
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संबंधित प्रश्न
Write any one difference in the electronic configurations of group-1 and group-2 elements ?
What happens to the metallic character of the elements as we go down in a group of the periodic table?
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Why do elements in the same group show similar properties but the elements in different groups show different properties?
Given alongside is a part of the periodic table. As we move vertically downward from Li to Fr:
| Li | Be |
| Na | |
| K | |
| Rb | |
| Cs | |
| Fr | Ra |
What happens to their metallic character?
The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element having the largest atomic radius is:
(a) Mg
(b) Na
(c) K
(d) Ca
On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period?
(a) increases
(b) decreases
(c) remain the same
(d) first increases then decreases
In each of the following pair, choose the atom having the bigger size:
Na (At. No. 11) or K (At. No. 19)
Give the number of the group and the period of elements having three shells with three electrons in valence shell.
Name or state following with reference to the element of the first three periods of the periodic table.
A covalent compound formed between an element in period 1 and a halogen.
