The Structure of Atoms 0.0 / 5 ? ChemistryPhysical ChemistryASAQA Created by: yasmin.ioaCreated on: 21-06-22 00:52 What does atomic number (Z) mean? The number of protons in the nucleus of an atom (or ion). 1 of 8 What does mass number (A) mean? The number of protons and neutrons in the nucleus. 2 of 8 How do you calculate the number of neutrons in the nucleus? You subtract the atomic number (the number of protons) from the mass number (the number of protons and neutrons). 3 of 8 With elements from the periodic table, what do the subscript numbers mean? The number above, (A) is the mass number, the number of protons and neutrons. The number below, (Z) is the atomic number. 4 of 8 Why don't atoms have an overall charge? Because the number of positively charged protons is the same as the number of negatively charged electrons. 5 of 8 How does an ion form? When an atom either gains or loses electrons. 6 of 8 How are positive or negatively charged ions formed? When atoms lose electrons they form positively charged ions; when atoms gain electrons they form negatively charged ions. 7 of 8 What is an isotope? Atoms with the same number of protons, but different numbers of neutrons. 8 of 8
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