They both have 1 electron in their valence shell.....
Check the attached file for the answer.
X is the chemical symbol of the element
Answer:
Explanation:
The speed of sound in the air mainly depends on temperature. At high altitudes, where it is much colder, sound travels slower. The higher the temperature, the faster the air molecules are moving to begin with, and the quicker they bump into each other as a sound wave passes through.
