Advertisements
Advertisements
प्रश्न
Name and state the following with reference to the elements of the first three periods of the periodic table.
Noble gas with duplet arrangement of electrons.
Advertisements
उत्तर
Element is Helium
संबंधित प्रश्न
What are the following group known as?
Group 17
Name two elements of each group.
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?
Comment on the (i) reactivity (ii) colour (iii) physical state of group 17 elements.
Name the gas used in:
Light bulbs
Give reason:
Alkali metals and halogens do not occur free in nature.
Write a short note on the following type of element –
noble gases
State the main helpful features of the long form of the periodic table.
Name or state following with reference to the element of the first three periods of the periodic table.
An alkaline earth metal in period 3.
