Atomic Number Charts

Atomic Number Charts

Protons, Neutrons and Electrons

• The number of protons is the same as the atomic number.

• The number of electrons is the same as the number of protons in a neutral atom.

• The number of neutrons in atoms of the same element is not always the same.

Multiple Choice

What do we call atoms of the same element with different numbers of neutrons?

• isomalt

• pseudo-atoms

• isotopes

• ions

Finding the number of neutrons

• The mass number of an atom is equal to the number of protons + neutrons

• mass number - protons = neutrons

Multiple Choice

How many neutrons does calcium-41 have?

• 41

• 20

• 21

• 18

Fill in the blanks!

You can fill in all the missing information just based on what you are given. For zinc with a mass number of 65, the symbol is Zn. Use the periodic table to find the atomic # (# of protons), which is 30. Then, find the number of neutrons by taking 65-30= 35 neutrons.

Multiple Choice

Which set of information completes the 2nd row of the chart?

• Sulfur; 17; 32

• Sodium; 11; 28

• Sulfur; 16; 32

• Sulfur; 16; 33

Multiple Choice

Which set of information completes the 3rd row of the chart?

• Barium; Ba; 138

• Lead; Pb; 82

• Barium; Br; 136

• Barium; Ba; 56

Multiple Choice

What would the number of neutrons be in row 4 (Ti with a mass number of 48)?

• 22

• 26

• 48

• 70

Multiple Choice

What is the mass number in row 5 (Iodine with 73 neutrons)?

• 73

• 126

• 53

• 67