c4 revision 2.0 / 5 based on 1 rating ? SciencePeriodic tableGCSEOCR Created by: blessingsCreated on: 13-03-13 19:58 what is Ionic bonding Atoms turn into ions (become charged by losing or gaining electrons) and then the positive ions attract the negative ions. 1 of 9 what is Covalent bonding Two atoms share a pair of electrons. 2 of 9 All atoms have a central nucleus.Why is the nucleus is positively charged because it is made up of protons which are positively charged and neutrons which are neutral 3 of 9 what is the nucleus surrounded by? negatively charged electrons arranged in shells. 4 of 9 why does atoms have no charge because it has the same number of protons and electrons, so they cancel out each other’s charge. 5 of 9 what is mass number The mass number is the total number of protons and neutrons in the atom. 6 of 9 what is atomic number The atomic number is the number of protons and number of electrons in the atom. 7 of 9 what do all atoms of a particular element have same number of protons. 8 of 9 why are some atoms of a particular element called isotopes some elements have varieties that have different numbers of neutrons 9 of 9
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