Explanation:
Atomic number of hydrogen is 1 as it is the very first element of periodic table.
Hence, electronic configuration of hydrogen is .
On the other hand, second element of the periodic table is helium and its atomic number is 2. Helium is also known as a noble gas.
Therefore, electronic configuration of helium is .
Thus, we can conclude that electronic configuration of hydrogen and helium is and
.
B Ability to burn
Explanation: