They have the same number of protons
Answer:
Ne
Explanation:
Noble gas, Unreactive therefore does not exist as a diatomic molecule
Answer:
In science, sound is defined as the transfer of energy from a vibrating object in waves that travel through matter. Most people commonly use the term sound to mean what they hear when sound waves enter their ears. The tree above generated sound waves when it fell to the ground, so it made sound according to the scientific definition
Explanation:
sound waves
Answer:
Yes they are found in same period
