Electrons, protons, neutrons
Structure of Atom (School Level) · Chemistry
Study notes
An atom has 11 protons, 12 neutrons and 11 electrons. Identify it completely. Step 1: Atomic number Z = protons = 11 → sodium (Na). Step 2: Mass number A = 11 + 12 = 23. Step 3: Electrons = protons = 11 → neutral atom. Step 4: Written as ²³₁₁Na. Answer: neutral sodium-23 atom.