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प्रश्न
Name and state the following with reference to the elements of the first three periods of the periodic table.
Group whose elements have zero valencies.
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उत्तर १
Noble gases
उत्तर २
Group is 18th or O group
संबंधित प्रश्न
Consider the following elements: Be, Li, Na, Ca, K. Name the elements of (a) same group (b) same period.
What are the following group known as?
Group 1
How do atomic structures (electron arrangements) change in a period with an increase in atomic numbers moving left to right?
What happens to the number of valence electrons in atoms of elements as we go down a group of the periodic table?
How do alkaline earth metals occur in nature?
Comment on the (i) reactivity (ii) colour (iii) physical state of group 17 elements.
Name the gas used in:
Light bulbs
State the characteristics which remain similar in moving down in a group of the periodic table.
Write a short note on the following type of element –
halogens
Write a short note on the following type of element –
noble gases
