Astatine. Because it has the smaller shell of electrons. I believe
A. Theresa is going to be my girl this year, he promised himself as he left the gym full of students in his new fall clothes.
B is the.answer for this problem
When you heat an atom, some of its electrons are "excited* to higher energy levels. When an electron drops from one level to a lower energy level, it emits a quantum of energy. ... The different mix of energy differences for each atom produces different colours. Each metal gives a characteristic flame emission spectrum.
