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Explain the Bohr's model?
Bohr's Model : Electrons move around the nucleus at tremendous speeds and occupy most of the space in an atom. The exact position or location of an electron at any given moment can only be predicted on the basis of probability. In a widely accepted model of the atom originally proposed by Neils Bohr, electrons move in spherical spaces called orbitals, or shells, which correspond to different energy levels. Electrons are distributed according to their energy levels, with the higher energy electrons residing in the outer shells. The innermost shell contains only 2 electrons. In common elements, the next outer shells contain 8 electrons each.
Atoms either gain, lose, or share electrons in the outer shells. Because the outer shells of many atoms are incomplete, most atoms will interact with other atoms during chemical reactions to achieve stable outer shells. The number of electrons that an atom must either gain, lose, or share to complete the outer shell is known as its valence, or oxidation number. For example, carbon has six electrons, two in its first energy level and four in the outer level. Thus, it can form a stable outer shell by gaining, losing, or sharing four electrons to complete its outer shell when it joins, or bonds, with another atom or atoms to form a compound. The following table lists the oxidation numbers of some important ions frequently used in Biology.
Hydrarch - Kinds of Succession When succession takes place in a wet area, that is, succession progresses from hydric to mesic conditions. This can be further subdivided as:
Determine the Basic Seven Food Groups - Nutritions? These basic seven food groups are: 1) Cereals and cereal products 2) Pulses (also meat and meat products) 3) Milk and m
Of the cell types observed (Paramecium, Euglena, Yeast, Elodea, cheek cells), would any cell "verify" the cell theory? Explain your answer.
describe the procedure of excretion in reptiles
Q. What are the nucleic acids? What is the historic origin of this name? RNA and DNA, the nucleic acids, are the molecules responsible for the hereditary information that comma
TYPES OF DISEASE communicable Caused by infective agents disease
Antioxidants Antioxidants are the substances that can delay onset, or slow the rate of oxidation of autoxidizable materials. By virtue of this property, they provide protect
What is population density? Population density is the relation among the number of individuals of a population and the area or volume they occupy. For instance, in 2001 the hum
MIDDLE LAMELLA It is thin, amorphous, intercellular matrix between 2 adjacent plant cell. The cells of plant tissue generally cemented together by an intercellular matrix
Mating and Fertilisation In all animals sperms are motile and have to move and seek the eggs to fertilise them. For this an aqueous environment is necessary. This need of a li
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