Nuclear Reactions and Atomic Numbers

This video tutorial discusses nuclear decay, focusing on transmutation equations. It explains nuclear symbols, atomic and mass numbers, and how to balance nuclear equations. Examples include radium decay emitting an alpha particle and uranium bombardment leading to transmutation. The tutorial emphasizes the importance of balancing mass and atomic numbers on both sides of the equation to solve for unknowns.

What does the bottom number in a nuclear symbol represent?

• Mass number

• Atomic number

• Number of neutrons

• Number of electrons

In a nuclear equation, what must be equal on both sides of the yield sign?

• Only the atomic numbers

• Only the mass numbers

• Both mass and atomic numbers

• Neither mass nor atomic numbers

When uranium is bombarded with neutrons, it splits into which two elements?

• Radium and Radon

• Helium and Hydrogen

• Barium and Krypton

• Iodine and Yttrium

What is the atomic number of the element that radium 226 decays into after emitting an alpha particle?

• 82

• 84

• 86

• 88

What is the mass number of radon when radium 226 emits an alpha particle?

• 228

• 222

• 226

• 224

In the uranium example, what is the mass number of the unknown element after the reaction?

• 235

• 139

• 92

• 95

What is the atomic number of yttrium, the unknown element in the uranium example?

• 53

• 95

• 39

• 92

Which element is represented by the atomic number 39 in the periodic table?

• Yttrium

• Radon

• Barium

• Iodine

What is the result when uranium 235 is bombarded with a neutron and gives off two neutrons?

• Iodine and Yttrium

• Radium and Radon

• Barium and Krypton

• Helium and Hydrogen

What is the significance of balancing transmutation equations?

• To find the number of neutrons

• To determine the number of electrons

• To ensure mass and atomic numbers are conserved

• To calculate the energy released