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प्रश्न
Name the non-metals in the first twenty elements.
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उत्तर
C, N, O, F, Ne, P, S, Cl, Ar, H and He.
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संबंधित प्रश्न
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
What are the merits of the modern periodic table of elements?
Name two elements in each case:
Actinides
How does the electronic configuration of an atom relate to its position in the modern periodic table?
What is the number of elements in the 3rd period, of the modern periodic table?
Give the symbol and valency of the following element and radical.
Sulphate
Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.
| Periods | Group 2 | Group 17 |
| 2 | ----- | A |
| 3 | B | ----- |
| 4 | ----- | C |
- What is an element metal or nonmetal?
- Which is the outermost orbit of element B?
- Identify C element and it's physical state.
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
Define periods of modern periodic table.
