What are the Essential elements? How are they classified?
Answers
Answer:The essential elements are further classified into two categories : Macroelements (Major elements) : These elements are required by the plant in larger quantities. These are Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Potassium, Magnesium, Calcium
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Answer:
Explanation:
ELEMENT :
A species of atoms; all atoms with the same number of protons in the atomic nucleus.
An element is defined by how many protons it has.
Change the number of electrons an atom has and you are just forming the corresponding ion of an element.
Change the number of neutrons an atom has and you are just forming an isotope of the element.
Change the number of protons and you now have a new element.
All the elements* are on the periodic table of elements. If it isn't on there, it is not an element but a compound.
* that we have discovered. If it isn't on there then it is still a compound though.
CLASSIFICATION:
Elements are mainly classified into metals and non-metals.
Metals are lustrous, malleable, ductile and are good conductors of heat and electricity. They are the solids at room temperature only except Mercury.
Different metals have different reactivities with water and dilute acids.
The list of common metals arranged in order of their decreasing reactivity is known as the activity series.