What is Atomic number ?
Atomic number is equal to the number of electrons in the neutral atom of an element .
ICSE
What is Neutron ?
The subatomic particle of an atom with no charge and mass almost equal to the mass of the proton, i.e. hydrogen atom.
What is Proton ?
The subatomc particle having mass 1 amu, i.e. equal to hydrogen atom and has unit positive charge.
What is Electron ?
The subatomic particle having a unit negative charge and a mass equal t 1/1837 of hydrogen atom.
What is Nucleus ?
There is a positively charged mass at the centre of the atom, known as the nucleus.
What is Atom ?
An atom is the smallest particle of an element that exhibits all the properties of that element. It may or may not exist independently but takes part in every chemical reaction.
What is Elements ?
Element is a pure substance that can neither be formed from, nor decomposed into simple substances by ordinary physical or chemical methods .
What are hygroscopic substances ?
Certain substances absorb moisture from the atmosphere when they are exposed to it but not enough to form solution. Such substances are called hygroscopic substances.
What is Stalactite?
The conical pillar which grows downwards from the roof is called Stalactite.
What are Dehydrating agents ?
Dehydrating agents are substances that can remove even the chemically combined water molecules from compounds .