According to Dalton’s atomic theory, the atom was indivisible and indestructible. But the discovery of two fundamental particles (electrons and protons) inside the atom, led to the failure of this aspect of Dalton’s atomic theory. It was then considered necessary to know how electrons and protons are arranged within an atom. For explaining this, many … Read more
Atoms of the same element having different mass number are called isotopes of each other.
The electrons at the outermost principal energy level of an element are called the valence electron of that element.
The change of material property with the successive change of period and group in the periodic table is termed as the periodicity of elements.
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Diffusion The tendency of solid, liquid, or gas to spread spontaneously and uniformly in any medium is called diffusion. In the diffusion process, a solid, liquid, or gas moves spontaneously from a place of higher concentration to a lower concentration. Remember, what happens if you leave a perfume bottle with its lid open in the … Read more
What is diffusion? Diffusion is the random movement of molecules from an area of high concentration to an area of low concentration. It happens naturally due to thermal energy, without any outside force. What are the different types of diffusion? There are three main types of diffusion: What factors affect the rate of diffusion? The … Read more
What is periodicity? Periodicity basically means something that happens again and again at regular intervals. You can see periodicity in different fields: What causes the periodicity in the periodic table? The magic behind the periodicity in the periodic table lies in the arrangement of electrons around the atom’s nucleus, specifically the valence electrons. These valence … Read more