What element has 12 protons 12 neutrons and 11 electrons

1) this is the structure in the cell nucleus that houses a cell's genetic information

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

Use the periodic table to complete this equation that represents nuclear fission processesun - ba c 3 n