Across |
2. | subatomic particle with a positive charge |
5. | houses protons and neutrons |
6. | any atom or group of atoms with a positive charge |
8. | atoms of the same element that have a different number of neutrons. |
9. | the number of electrons need to fill the outermost level of an atom |
15. | credited with the discovery of the electron and the plum pudding model of the atom |
16. | credited with the discovery of the neutron |
17. | the horizontal rows of a periodic table |
18. | the vertical columns on the periodic table |
20. | indicates the periodic element as well as the number of protons (2 Words) |
21. | the number of protons and neutrons (2 Words) |