Build a hydrogen atom by adding 1 proton, 1 neutron and 1 electron to your atom. What is the net charge and the atomic mass? Now add one more electron to your hydrogen atom. What changes? Remove the extra electron. Now add one more neutron to your hydrogen atom. What changes? Remove the extra neutron. Now add one more proton to your hydrogen atom. What changes? Which particle determines the name of the element you are building? Part 2: Symbol Instructions: At the bottom of the simulation (or click on the link again), click on “Symbol” Keep all your settings from the first simulation the same Build a hydrogen atom again (1 proton, 1 neutron and 1 electron.) Its symbol should look like what you see to the right. Describe what is being shown in the symbol. Now reset your atom and build the following. Record the information shown in the symbol in the table below. Particles What element is it? What is its mass? What is its charge? Protons: 6 Neutrons: 6 Electrons: 6 Protons: 7 Neutrons: 6 Electrons: 6 Protons: 6 Neutrons: 7 Electrons: 7 The number in the bottom left hand corner is called the atomic number. Which particle number determines the atomic number? The number in the top left hand corner is called the atomic mass. Which particles get added together to find the mass? Why do only these particles contribute to the mass? The number in the top right hand corner is called the charge. How is the charge determined from the number of particles? Why do only two particles contribute to the charge? Describe the difference between an atom that is positively charged and an atom that is negatively charged (be specific - relate this to the number of subatomic particles).