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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
What is the number of valence electrons in the atoms of first elements in a period?
Name the scientist who stated the modern periodic law.
Name two elements in halogens.
Name two elements in each case:
Actinides
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Hydroxide
What are the periods in a periodic table?
Elements in the modern periodic table are arranged in ______groups and______ periods.
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
Group 16 elements are collectively called as ______.
