Determine the Z and A number for an atom with 20 protons, 19 neutrons and 18 electrons. What element would this be in the periodic table? Write the symbol for this atom with the Z and A numbers accordingly. Is this an atom or an ion? If an ion, what is the charge on it?

Question

Determine the Z and A number for an atom with 20 protons, 19 neutrons and 18 electrons.  What element would this be in the periodic table? Write the symbol for this atom with the Z and A numbers accordingly.  Is this an atom or an ion?  If an ion, what is the charge on it?

anonymous · Answer

First figure out which element this is. The number of protons determines the atomic number. 
Next work out the mass number (protons + neutrons). 
Finally, determine the net charge by adding together the number of proton and electron charges.