dentify the missing information for each atom or ion. Note that the atoms and ions are not necessarily neutral. A Se ion has a mass number of 76 and a charge of −2 . Determine the number of neutrons, protons, and electrons in this ion. number of neutrons: number of protons: number of electrons:

1.)

Identify the missing information for each atom or ion. Note that the atoms and ions are not necessarily neutral.
A Se ion has a mass number of 76 and a charge of −2 . Determine the number of neutrons, protons, and electrons in this ion.
number of neutrons:
number of protons:
number of electrons:
An ion has a mass number of 65, 36 neutrons, and a charge of +1 . Identify the element symbol, and determine the number of protons and electrons in this ion.
element symbol:

number of protons:
number of electrons:
An atom or ion has 43 neutrons , 36 protons, and 36 electrons. Identify the element symbol, and determine the mass number and charge for this atom or ion.
element symbol:

mass number:
charge:

2.) 

Determine the number of electrons lost or gained when each atom forms an ion.
Be

electrons.

Se

electrons.

I

electrons.

P

electron