The Law of Octaves, proposed by John Newlands in 1865, states that when elements are arranged in increasing order of their atomic masses, the properties of the eighth element are a repetition of the properties of the first element. If elements are organized following a sequence of lower to higher atomic mass, there is evident … Read more
Thomson proposed the model of an atom to be similar to that of a Christmas pudding. The electrons, in a sphere of positive charge, were like currants (dry fruits) in a spherical Christmas pudding. We can also think of a watermelon, the positive charge in the atom is spread all over like the red edible … Read more
The pressures of the ingredients of body spray inside and outside of the container are not the same. The pressure is greater inside the container. When the molecules of the gas come out through small pores into a low-pressure zone from a high-pressure zone, effusion happens. Due to the application of pressure, the molecules present … Read more
All works in the laboratory are carried out in such a way that no undesirable incident takes place. However, in case of an accident, first aid is given and later, a doctor’s advice is sought for the treatment. The affected person should be brought immediately to the clinic or hospital for treatment. First aid materials … Read more
Electronegativity is the tendency of atoms to attract a shared pair of electrons towards themselves in a covalent bond formed between it and another atom.or,The capacity of an element to attract more shared electrons between two elements during the formation of a covalent bond it is called its electronegativity.or,When two atoms of a molecule are … Read more
Electronegativity is a measure of the ability of an atom or molecule to attract electrons toward itself in a chemical bond. It is a fundamental concept in chemistry that helps us understand the behavior of molecules in chemical reactions. Electronegativity is usually measured using the Pauling scale, which assigns values between 0 and 4 to … Read more
In order to overcome the objections raised against Rutherford’s model of the atom, Neils Bohr put forward the following postulates about the model of an atom: These orbits or shells are called energy levels. Energy levels in an atom are shown in figure.These orbits or shells are represented by the letters K,L,M,N,… or the numbers, … Read more
The physical and chemical properties of the elements repeat periodically with their atomic number.