what is atomic mass unit
Define and explain atomic mass of an element.What is atomic mass unit?
Ans- The atomic mass of an element isthe relative mass of its atom as compared with the mass of a particular atom of carbon (12C) taken as 12 units. Thus the atomic mass of an element indicates the number of times one atom of element is heavier than th of a (1/12)th of a 12C atom.
For example, the atomic mass of oxygen is 16 which indicates that an atom of oxygen
is 16 times heavier than (1/12) th of a 12C atom.
One atomic mass unit (u) the mass of 12C atom.
How do atoms exist ?
Ans- Individual atoms of most elements do not exist independently. These either aggregate to form elements or form molecules or ions which also aggregate in large numbers to form the matter that is available to us
Why is it not possible to see an atom with naked eyes?
Ans- The size of an atom is very very small. Further atoms of most elements do not
Write the symbols of the following chemical elements :
Mercury, Potassium, Silver, Boron, Chlorine, Gold, Lead, Copper, Aluminium.
Ans- Mercury (Hg), Potassium (K), Silver(Ag),Boron(B), Chlorine (Cl), Gold (Au), Lead(Pb), Copper(Cu),Aluminium (Al).