Board problems relating to Worksheet: Chapter 5
How many protons, neutrons, and electrons in:
(b) Ag 47, 61, 47
(d) U 92,146, 92
How to determine the electrons, protons, and neutrons in an ion:
How many protons, neutrons, and electrons in Al
The protons and neutrons are the same as in an atom:
protons = 13 ( the atomic number), neutrons = 14 ( mass
number - atomic number).
In an atom ( which is
neutral) the electrons would be the same as protons, 13,
but since Al has a 3+ charge the protons and electrons
can't be equal.
Now, don't add three protons because
that will change the element from Al to S.
So, to make
the charge we take away 3 electrons( negatives ).
we will have 13 + (protons) and 10 - ( electrons).
add 13+ and 10- you get 3+ which is the charge of the
Try this one:
how many protons, neutrons, and
electrons in S
protons = 16,
neutrons = 16, electrons = 18
16+ (protons) + 18- ( electrons ) = 2-
Do not try to take or add protons.
They are in the
nucleus and bound tightly.
and Atomic Number (a) p + n