Answer to Question #63646 in General Chemistry for Emmanuel D. Kollie

Question

An Atom has 91 protons and 140 neutrons: A) Fine the mass number and the atomic number B) Find the number of electrons C) Write the hyphen notation and nuclear symbol D) Find the total number of subatomic particle.

Answer 1

A) Atomic number = number of protons = 91

Mass number = number of protons + number of neutrons = 91 + 140 = 231

B) Number of electrons = Atomic number = number of protons = 91

C) Hyphen notation – Protactinium-91

Nuclear symbol - Pa

D) Total number of subatomic particles = electrons + protons + neutrons = 91 + 91 + 140 = 322