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प्रश्न
Name or state following with reference to the element of the first three periods of the periodic table.
The non-metallic element present in period 3 other than sulphur and chlorine.
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उत्तर
P [Phosphorus]
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संबंधित प्रश्न
Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic number.
Na, Mg and Al are the elements of the same period of Modern Periodic Table having, one, two and three valence electrons respectively. Which of these elements (i) has the largest atomic radius, (ii) is least reactive? Justify your answer stating reason for each case.
In which part of a group would you separately expect the elements to have the greatest metallic character
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?
Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?
An element X belong to 4th period and 17th group, state.
no of valence electrons in it
Which element has:
twice as many electrons in its second shell as in its first shell?
What is meant by a Group in the Periodic Table?
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].
Which of the following would weigh the least?
(Atomic masses C = 12, 0 = 16, Na = 23)
