Dobereiner’s triads and Newland’s Octaves

Dobereiner’s triads In since 1820 a German Chemist John Wolfgang Dobereiner arranged similar elements in a group of three.These elements of three groups are known as a Dobereiner triads. Dobereiner said that when three elements in a triads are arranged in increasing order of atomic masses then the relative atomic mass of the middle one is very relative or close to the average of other two elements.                                         ...

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Compound & Mixture

Compound & Mixture  Compound The Substance which is formed by the chemical combination of two or more atom in fixed proportion is called compound. Examples: C12O11H22, CO2 etc. Explanation:The Compound is pure form of matter.The ratio of an element in a compound is always fixed. The properties of compound is always different from the element forming it. E.g. Sugar (C12O11H22) is made of tasteless element but sugar is sweet. As compound is pure substance therefore showing fixed...

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Uses of Isotopes

Uses of Isotopes Isotopes: Isotopes are the atoms of same element with same proton number but different proton number. Radioactive isotopes are the isotopes of radioactive element. Thus Radioactive or radioisotopes are used to understand the mechanism of different reactions. Such as C 14 which is radioactive isotope of carbon is used to label CO2 i-e how CO2 can be used to form glucose through photosynthesis. Archaeological or Geological:Radioactive or radioisotopes are used to estimate...

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Nature of Molecule

Nature of Molecule Onllogy, in this article, is going to explain you about the Molecules and its type. ANd also about the chemical species and also about the free radical. Molecule It is defined as "An atom having covalent bond and exist freely in nature is known as molecule". Such as O2, H2 etc. Types of Molecule There are six types of molecules and these are Monoatomic Molecule Diatomic Molecule Triatomic Molecule Polyatomic Molecule Homo atomic Molecule Hetero atomic Molecule  Monoatomic Molecule:A Molecule...

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Distribution of electrons in Shells

Distribution of electrons in Shells In this articles, today, onllogy is going to make you understand about the electrons distributed in different shells. Here, we explain the formula too , by which we calculate the number of electrons in  the shells. so, let's start and have a look on it. Distribution of electrons in Shells There are four shells as we all know and the electrons present in these are are different i-e            1st shell (K shell)  ...

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Orbital Speed of artificial satellite

Orbital Speed of artificial satellite Satellite:  Any object that revolves around another object or planet is called satellite of that object or planet. The satellites are of two types 1.    Natural satellite 2.    Artificial satellite 1 . Natural satellite:  A satellite which naturally revolves around the planets or starts are called natural satellite. Such as moon, sun etc. 2 . Artificial satellite:  A satellite which is sent by the scientist...

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Variations of Gravity (g) with altitude

Variations of Gravity (g) with altitude Suppose a body of mass m is placed at the height h from the surface of earth. Here the distance b/w them is R + h where M is the mass of earth. Suppose gh is the gravitational acceleration at this position. So gravitational force is F = GMm / (R+h) 2 ------ eqn (1) as we know that the force is equal to the weight of body. That is F = W = mg   ------ eqn (2) From both eqns we get gh = GM / (R+h) 2 --------- eqn(3) As the mass...

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