G. H2S contains two hydrogen atoms
Answer:
Group 18th
Explanation:
The group 18th of periodic table which is composed of Noble gases mainly was missing from the Mendeleev's periodic table. The reason for this is that Noble gases are least reactive, therefore, it was difficult to predict such elements which do not react with other elements.
They are good conductors of heat and electricity.
They are solid at room tempature
They have a high melting point
Answer:
B
Explanation:
it is bigger then earth so it will have a greater mass.
Elements because elements make up atoms which make up everything
