17. Believed electrons moved in a circular orbit around the nucleus. ____________________________18. Quarks make up ____________ and ______________.19. How are ions formed?20. A ___________ ion is formed when an atom loses an electron. It is called a ________________.21. A ___________ ion is formed when an atom gains an electron. It is called a ________________.Chapter 10 Review Questions1. Column on the periodic table. ___________________________2. A row on the periodic table.

A   atom forms a   ion by ______.

A ___________ ion is formed when an atom loses an electron. It is called a

ic particle with one positive charge is called a _________________.4. A neutral particle in the nucleus of the atom is called a ________________.5. The area around an atomic nucleus where an electron is most likely to be found is described as the _______________________.6. The number of protons in an atom of an element. _________________7. Any of the two or more atoms of the same element that have different numbers of neutrons. _______________8. The sum of the number of prot

9. This term describes elements that spontaneously emit radiation. _____________________10. An atom that is no longer neutral because it has gained, or lost electrons is called an _____.11. The ______________ contains protons and neutrons in an atom.Scientists who contributed to the Atomic Theory12. Discovered the neutron. ___________________________13. Believed an atom, or “atomos” cannot be divided, created, or destroyed. ____________________________14. Showed that most of the mass and positive charge of an atom is concentrated in its center _____________________15. He discovered the electron; proposed the plum pudding model of the atom. _________________________________16. Proposed an atomic model where atoms cannot be divided, created, or destroyed.

An ion formed from an atom has a 4+ charge. The number of electrons present in the ion is 21 and the number of neutrons is 30. Identify the element.