1) The smallest unit of an element that has all the properties of that element  a) atom b) molecule c) electron d) neutron 2) A subatomic particle with a negative charge a) atom b) neutron c) proton d) electron e) nucleus 3) A subatomic particle with no charge a) atom b) nucleus c) electron d) neutron e) proton 4) A subatomic particle with a positive charge a) electron b) neutron c) proton d) nucleus e) molecule 5) A substance made up of only one kind of atom a) element b) chemical symbol c) proton d) periodic table 6) Equals the number of protons in an atom's nucleus a) element symbol b) atomic number c) atomic mass d) periodic table 7) Protons and neutrons are found in the _________ of an atom. a) electron cloud b) nucleus c) mixture d) energy levels 8) The overall charge of an atom is neutral if there are - a) Equal numbers of protons and neutrons b) More protons than electrons c) Equal number of protons and electrons d) Less neutrons than protons 9) A neutral atom has 15 electrons and 15 protons. Name that element! a) Carbon b) Oxygen c) Magnesium d) Phosphorus 10) The atomic number of an element is 21. Name that element! a) Nitrogen b) Scandium c) Copper d) Radium

Atoms

由
打印
嵌入

排行榜

视觉风格

选项

切换模板

恢复自动保存：？