Question

What is the atomic mass in hydrogen?

Answer 1

Atomic mass in hydrogen is :

$\color{red}{1.00794 }$AMU

OR

Atomic Mass = Total No. Of proton + Total no. Of neutron

= 0+1= $\color{red}{1 }$

ADDITIONAL-

Symbol of Hydrogen is :$\color{red}{H }$

Atomic Number of hydrogen :$\color{red}{1 }$

Hydrogen is the $\color{red}{Lightest }$ $\color{red}{element}$in the periodic table.

Hydrogen has $\color{red}{three }$$\color{red}{isotopes }$or different versions of hydrogen.

Answer 2

Atomic mass of hydrogen is '1u'.

More accurately, the atomic mass of hydrogen is '1.00794 u' .

The symbol of Hydrogen is 'H' (capital 'H' ).

⬇We know that the formula of Atomic mass unit (AMU) is⬇

➡( Total Protons ) + ( Total Neutrons )

So, Number of Protons in Hydrogen = 1

Number of neutrons in Hydrogen = 0

1 + 0 = 1 AMU (Mostly)

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But the atomic mass of hydrogen is not always same because 'Hydrogen' is an exceptional case which contains 3 types of isotopes. Their atomic mass get changed but their atomic number is same.

1• Protium is the first isotope which contains 1 proton and 1 electron but no neutron. Its atomic mass is 1.

2• Deuterium is second isotope which contains 1 proton, 1 neutron and 1 electron. Its atomic mass is 2.

3• Tritium is third type of isotope which contains 1 proton, 2 neutrons and 1 electron. Its atomic mass is 3.