Ingia
WAEC - Chemistry (2005 - No. 2)
What is the mass number of an element having 20 neutrons, 15 protons and 15 electrons?
15
30
35
50
Maelezo
Mass number = Protons = Neutrons = 15 + 20 = 35
Maoni (0)
Ingia Ili Kutoa Maoni
Tangazo
Ruhusu javascript kupakia vizuri ukurasa huu
