Explain the bohr''s model, Biology

Assignment Help:

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.

1355_bohr model.png

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.

1576_table bohr model.png


Related Discussions:- Explain the bohr''s model

Indirect uses of biodiversity, The cost of replacing these indirect uses of...

The cost of replacing these indirect uses of biodiversity, even if it were technically possible, would be so high as to render it impossible to duplicate. We also do not know how

Types of plastids, TYPES OF PLASTIDS (1 ) LEUCOPLASTS These are p...

TYPES OF PLASTIDS (1 ) LEUCOPLASTS These are present in ground parts of plants, internal parts of herbaceous stems and deep tissues of plants where sun light is not avail

Define interferons - humoral mechanisms, Define Interferons - Humoral Mecha...

Define Interferons - Humoral Mechanisms Interferons are soluble proteins secreted naturally when cells become infected by foreign bodies. Infected lymphocytes release interfero

Does seed germination affect plant growth, Does seed germination affect pla...

Does seed germination affect plant growth? Germination does affect plant growth Without germination in the plant, the plant is not capable to grow. The germination is the st

Define effect of feeding method on drug availability, Define Effect of feed...

Define Effect of feeding method on drug availability? The form in which a drug is administered or enters the body can influence its absorption, metabolism or excretion. This be

How the brain influences or controls immune system, How the brain influence...

How the brain influences or controls immune system Scientists are still working to determine to what degree, and how, the brain influences or controls immune system functions,

Why does bark often break and die naturally, Why does bark often break and ...

Why does bark often break and die naturally? Bark is the mature periderm of the branches, stem and roots. It breaks and dies when these structures grow and thus the peridermal

Glomerular filtrate in comparison to the blood, Q. What is the major transf...

Q. What is the major transformation presented by the glomerular filtrate in comparison to the blood? Glomerular filtrate is the name given to the plasma after it has entered th

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd