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प्रश्न
Name and state the following with reference to the elements of the first three periods of the periodic table.
Non-metallic elements present in Period 3 of Groups 15 and 16.
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उत्तर
Non-metallic elements present in Period 3 of Groups 15 and 16 - Phosphorus and sulphur
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संबंधित प्रश्न
An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'.
What is meant by 'group' in the modern periodic table? How do the following change on moving from top to bottom in a group?
(i) Number of valence electrons
(ii) Number of occupied shells
(iii) Size of atoms
(iv) Metallic character of element
(v) Effective nuclear charge experienced by valence electrons
How do the valency and the atomic size of the elements vary while going from left to right along a period in the modern periodic table?
Which element has a total of three shells, with four electrons in its valence shell?
How does the tendency to lose electrons change as we go down in group 1 of the periodic table? Why does it change this way?
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?
Chorine in the periodic table is surrounded by the elements with atomic number 9, 16, 18 and 35.
Which of these have physical and chemical properties resembling chlorine.
Write two reasons responsible for late discovery of noble gases ?
Give the number of the group and the period of elements having three shells with three electrons in valence shell.
An element belongs to the third period and Group IIIA (13) of the periodic table. State: if it is a metal or non-metal?
