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प्रश्न
What are groups and periods in the modern periodic table?
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उत्तर
- The horizontal rows are called periods. There are seven periods in the periodic table.
- Vertical columns in the periodic table starting from top to bottom are called groups. There are 18 groups in the periodic table.
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संबंधित प्रश्न
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
Explain why all the elements of a group have similar chemical properties.
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
Name two elements in Alkali metals.
Name two elements in Inert gas.
Name two elements in each case: Lanthanides
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)?
Right or wrong sentence.
The modern periodic table shows the molecular masses of the elements in each frame.
An element X which is a yellow solid at room temperature shows catenation and allotropy. X forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.
- Identify the element X
- Write the electronic configuration of X
- Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals?
- What would be the nature (acidic/ basic) of oxides formed?
- Locate the position of the element in the Modern Periodic Table.
