The number following the name of the element is the number of subatomic particles inside the nucleus of the atom. This means that it is the mass number of the isotope. The average atomic mass of the element is the sum of the products of the percentage abundance and mass number of the naturally occurring isotopes. 
Since, the average atomic mass of the hydrogen is nearest to 1 then, the most abundant isotope should be hydrogen-1. 
        
             
        
        
        
Answer:
Infectious diseases are commonly transmitted through direct person-to-person contact. 
The main four pathogens are virus, bacteria, protists and fungi.
Bacteria, fungi and protists can reproduce wherever the conditions are warm, with plenty of moisture, nutrients, and space. Viruses can only reproduce by invading living cells.
 
        
             
        
        
        
Answer:
The element will be 
Explanation:
Given that,
Number of proton = 80 
Number of neutron = 81
Number of electron = 79
We know that,
The atomic number is equal to the number of proton.
So, the atomic number is 80.
According to atomic number,
The element will be mercury.
We need to calculate the atomic mass
Using formula of atomic mass

Put the value into the formula


We need to find the element 
Using atomic mass and atomic number


So, the element will be

Put the value of A and Z
Hence, The element will be 
 
        
             
        
        
        
Answer:the other vaiabable
Explanation: