Conservation of mass and Elements

Elements

100

which is a classified as a balanced equation 

A 2H2+O2------2H2O 

B  4O2H+C9-------2S1F

C  7O9H+C9-------1S1F

what is 

A 2H2+O2------2H2O 

200

Using APE MAN 

Answer the following questions  potassium 

Atomic #_______

protons #______

Element symbol______

Atomic #__19_____

protons #___19___

Element symbol_ k_____

300

what is the basic unit matter

atom

400

What are the three subatomic particles

Protons (positive charge), neutrons (no charge), and electrons (negative charge)

500

 What are the two main parts of an atom?

The nucleus (where protons and neutrons are) and the electron cloud (where electrons are).