Counting Atoms Interactive Slides

There are two atoms of hydrogen

There are two atoms of sulfur

There are two molecules of H₂S

There are two atoms of oxygen

It shows the number of molecules or compounds present.

It shows the number of electrons in an atom.

It shows the number of protons in an atom.

It shows the number of neutrons in an atom.

Multiply the coefficient by the subscript for each element.

Add the coefficient and subscript for each element.

Multiply the coefficient by the atomic number.

Add the coefficient to the atomic number.

Coefficients multiply all atoms in the molecule or compound.

Subscripts only affect the element they follow.

If there is no subscript, there is only one atom of that element.

Coefficients only affect the first element in the formula.

4 hydrogen, 2 oxygen

2 hydrogen, 4 oxygen

2 hydrogen, 2 oxygen

4 hydrogen, 4 oxygen

2 hydrogen, 1 sulfur, 4 oxygen

1 hydrogen, 2 sulfur, 4 oxygen

2 hydrogen, 4 sulfur, 1 oxygen

4 hydrogen, 2 sulfur, 1 oxygen

Look at the given compound or molecule

Determine which elements are present

Make a list of all the elements

Count each element

To indicate the number of atoms of an element

To show the charge of an ion

To represent the mass number

To identify the type of bond