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प्रश्न
How many groups and periods does the modern periodic table have?
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उत्तर
The modern periodic table consists of seven horizontal rows and eighteen vertical columns.
संबंधित प्रश्न
Explain why, the noble gases are placed in a separate group.
Would you place the two isotopes of chlorine, CI-35 and CI-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
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)?
Answer the following question.
Define the atomic size. Give its unit of measurement. In the modern periodic table what trend is observed in the atomic radius in a group and a period and why is it so?
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To the left of the zig-zag line in the periodic table are the metal elements.
Noble gases belong to______ group of the periodic table.
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- 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.
An element has 2 electrons in its N shell.
State its position in periodic table.
