Identify the missing information for each atom or ion. Note that the atoms and ions are not necessarily neutral.

Question

A  ion has a mass number of  and a charge of  . Determine the number of neutrons, protons, and electrons in this ion.

An ion has a mass number of 65, 36 neutrons, and a charge of 

 . Identify the element symbol, and determine the number of protons and electrons in this ion.

An atom or ion has  , 36 protons, and 36 electrons. Identify the element symbol, and determine the mass number and charge for this atom or ion

Answer 1

Se is at no 34 meaning 34 PROTONS & 34 electrons if neutral

Since it is Se^2- it has 36 ELECTRONS

Mass is protons + neutrons. So it has 41 NEUTRONS

Protons + neutrons = mass number, therefore 65 - 36 =

29 PROTONS

The element is Cu

The number of electrons is 28 ELECTRONS

36 PROTONS identifies the element as Krypton (Kr)

Mass number = 36 + 42 = 78

Charge is zero since #protons = #electrons