Download Protons, electrons and neutrons worksheet

Protons, electrons and neutrons worksheet
Finding the number of protons, neutrons and electrons in an atom
Fill in the missing information for each element
Element
symbol
B
Atomic
Number
5
Number of
protons
5
Number of
electrons
5
Number of
neutrons
6
Mass
Number*
11
190
34
30
36
86
Au
200
0
19
8
Cr
55
27
Ag
26
83
22
Sg
Rapid Review:
Keep a periodic table handy to solve this puzzle.
Atomic symbol is the symbol you find for each element shown in the periodic table.
Magnesium symbol is Mg
Gold symbol is Au
Potassium symbol is K
Phosphorous symbol is P
Note: First letter of the element is not always the symbol.
Atomic number is the number on the top left of atomic symbol in periodic table
Atomic mass is the number just below the atomic symbol.
For example Boron has an atomic number of 5 and mass number of 11. (Mass number can be
rounded off)
Atomic number is always equal to the protons as well as the number of electrons in any
element.
Number of neutrons is given by subtracting atomic number from mass number.
So Boron has 5 protons, 5 electrons and 6 neutrons.