Mass of barium is 137.327 g/mol. Mass of radium is 226 g/mol.
Hence, radium has more mass therefore it will have the greatest density at STP.
Hope this helps :)
Answer:
6
Explanation:
electronic configuration is 2,6.
From electronic configuration we can see that oxygen have 6 electrons in its outermost shell.
Optrion A: when trying to determine a star's chemical composition.
Because unique atomic emission spectrum, analyzing the emission spectrum you can tell the chemical composition.