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प्रश्न
What are the elements.
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उत्तर
“Elements are pure substances made up of one kind of atoms and cannot be broken down into simpler substances.” 118 elements are there.
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
Fill in the following blank with suitable word:
Group 1 elements are called ...............
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
What is the usual number of valence electrons in the atoms of the last element in a period?
(b) What is the number of elements is 3rd period, the modern periodic table?
What are the advantages of the periodic table?
Group 13 to 18 : p block : : _______ : d block
- Write the electronic configuration of element X, given by its symbol as under: \[\ce{^40_20 X}\]
- Determine its position in the modem periodic table.
- What is the nature of its oxide?
- Name one other element of its group.
Name the non-metals in the first twenty elements.
Match the atomic number with the following:
A rare gas.
