Log Masuk
JAMB - Chemistry (1989 - No. 8)
The atomic number of caesium is 55 and its atomic mass is 133. The nucleus of caesium atom therefore contains
78 protons and 55 elections
55 protons and 78 neutrons
55 neutrons 78 electrons
78 protons and 55 neutrons
Komen (0)
Log Masuk Untuk Mengulas
Iklan
Benarkan javascript memuatkan halaman ini dengan betul
