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प्रश्न
State what the group number in the Modern Periodic Table signifies. Give a reason why elements in the same group, have similar valency and similar chemical properties.
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उत्तर
Group number signifies the number of electrons in the outer shell of an atom of the element.
- Number of electrons in the outer shell of all elements in a group is the same.
- Hence all elements in the same group of the periodic table have the same ‘Valency’ and similar ‘Chemical properties’.
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संबंधित प्रश्न
State modern periodic law.
The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.
(i) Which two elements belong to the same group?
(ii) Which two elements belong to the same period?
Give reasons for your choice.
Fill in the blank:
The horizontal rows in the periodic table are called _____________.
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
Give the symbol and valency of the following element and radical.
Bisulphate
Which of the following statements about the Modern periodic table is correct?
The arrangement of elements in the Modem Periodic Table is based on their ______
An element has the atomic number 12.
- Write the electric configuration.
- To which group and period does it belong.
An element with atomic number ______ will form a basic oxide.
An element has 2 electrons in its N shell.
State its position in periodic table.
