The Atom and Nucleus
Unit 14 - Nuclear Forces
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1. According to Atomic Theory, everything is made of tiny particles that cannot be ______________  ______________ further.
2. J.J. Thomson proved that the atom could not be a solid sphere and must contain ______________ charged particles.
3. The Nuclear Model proposed by Ernest Rutherford stated that an atom had a compact with a ______________  cloud around the central nucleus.
4. Neils Bohr proposed an adjustment to the Nuclear Model that described electrons as being ______________  ______________  around the nucleus, held in shells.
5. Ernest Rutherford and James Chadwick concluded that the nucleus must contain small, discreet particles called ______________ and neutrally charged particles called neutrons.
6. If you look at a Periodic Table, each box has a nuclear symbol on the right side. On the bottom left is the Atomic Number which tells how many ______________ an atom has. The top number is the Mass Number which is the total number of ______________ and ______________.
7. In an atom, number of ______________ and ______________ are the same.
8. Isotopes are elements with the same number of ______________, but a different number of ______________.
9. Only one or two isotopes of an element are stable, the rest are unstable and decay into other elements by radiating ______________, ______________ and ______________ rays.
10. An “excited” electron will jump to a higher energy level. Because it is unstable, it will fall back and re-emit its energy as ______________  ______________.
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