Electrons, Protons and Neutrons

Electrons:

Negatively charged ions are considered as electrons.
Electrons are discovered by J.J.Thomson.

Protons:

Positively charged ions are considered as protons.
It was discovered by Ernest Rutherford.

Neutrons:

The ions which contains No charge are called Neutrons.
It was discovered by James Chadwick.

Comments

Post a Comment

Popular posts from this blog

Types of stomata

Image
Types of Stomata:  On the basis of size, shape, number and and arrangement of Subsidiary cells stomata are classified into six types. Metcalf and Chalk defferentiated various types of stomata. A. Anamocytic: Guard cells are surrounded by 4 or more subsidiary cells which are similar in size and shape. Two subsidiary cells are present in bothpolar regions of guard cells and the remaining two are present on two lateral sides. Ex: Rananculaceae, Papaveraceae, Tridax procumbans. B. Anisocytic: Guard cells are surrounded by 3 subsidiary cells and are differ in size. Two subsidiary cells are bigger in size at lateral sides and one cell in smaller in size at one polar region of guard cells. Ex: Cruciferae, Umbilliferae, Datura. C. Paracytic: Guard cells are surrounded by two large subsidiary cells which are similar in size and are present at the two lateral sides of the guard cells. Ex: Rubiaceae, Magnoliaceae, Ixora. D. Diacytic: Guard cells are surrounded by two large subsidiary cells wh...
Read more..

what is Protoxylem, Metaxylem, Exarch and Endarch.

PROTOXYLEM:  The first formed primary xylem is called protoxylem METAXYLEM: The later formed primary xylem is considered as metaxylem. EXARCH: If protoxylem lies towards centre that is towards pith and metaxylem lies towards periphery then type of primary xylem is called exarch. ENDARCH: If protoxylem is towards periphery and metaxylem is towards centre(pith) then such arrangement of primary xylem is called as endarch.
Read more..