The answer is: A; Free Energy
Thick liquid lava
It's right
They have low boiling points
Answer:
A) Radium
i don't think that group 2 has period 7, it has only up to period 6 so it's probably Radium :))
Answer:
35Cl
Explanation:
The number of protons in an element is it's atomic number. Atomic number of Cl is 17. So the element is chlorine. The total sum of the number of protons and neutrons gives the mass number.So mass number of Cl is 17+18=35.So the given atom is Chlorine with mass number
35.