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प्रश्न
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
उत्तर
Such an arrangement of elements is called triads. Example: lithium sodium and potassium make a triad. Their atomic masses are 6.9, 23.0 and 39.0 respectively. An average mass of Li and K is approximately equal to the atomic mass of Na.
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संबंधित प्रश्न
In the Modern Periodic Table, which are the metals among the first ten elements?
Which element has two shells, both of which are completely filled with electrons?
Give alongside is a part of the periodic table :
As we move horizontally from left to right:
| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl |
(i) What happens to the metallic character of the elements?
(ii) What happens to the atomic size?
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
Give the chemical formula of sodium bicarbonate
Mendeleev's periodic table : atomic mass : : Modern periodic table : _______
Explain structure of modern periodic table in short.
The longest period of the Modern Periodic Table is period.
Which of the following elements would lose an electron easily?
Which of the following elements does not lose an electron easily?
