Answer:
6s
Explanation:
Barium is in group 2 of the s block and is in period 6.
I think the correct answer is C
If you type in the letters (uppercase and lowercase matters) into google it will give you the answers
Chemical changes only happen when the object changes form. Color is a physical property because you're not changing the object that you have, compressibility is also a physical property because you still have the same substance before and sfter, malleability again is another physical. Heat of combustion is physical, when you burn things it changes the substance. :)
