An element that does not occur in nature but can be produced artificially is
An atom of an element with mass number 23 and atomic number 11 will have:
Amount of water vapour (gaseous) in a given volume of air (Cubic Meter) is known as ?
Alzheimer's disease in human beings is characterised by the degeneration of?
Alcohol prepared by the distillation of wood is ?
it blows over the barren land
All the ecosystems taken together in a geographical area form a bigger unit called?
Among terrestrial (land) animals, which animal has the longest gestation period?
An alloy used in making heating elements for electric heating devices is