Question

one atomic mass unit (amu) is defined as the mass exactly one twelfth the ___ of carbon-12 isotope.The number of times one atom of given element is heavier than 1/12 th part of atomic mass of carbon-12 is called it's ________.atomic mass of an element is a ratio and has no units and is expressed in ______. The amu has been replaced by 'u, which is known as ________.
(9 th class)​

Answer 1

Explanation:

1st is :atomic mass unit

2nd is: atomic ratio

3rd is :amu

4rd is: unit