Презентация на тему The phenomenon of radioactivity. Radioisotopes. The nuclear reaction

neutral. True
The mass of an electron is equal

to the mass of a neutron. False
The number of neutrons in the nucleus can be calculated by subtracting the atomic number from the mass number. True
Every atom of nitrogen has 7 protons and 7 neutrons. False
The charge of all protons is the same. True
The atomic number of an element is the sum of the protons and electrons in the atom. False
Radiation decreases with the distance between you and the source. True

The nuclear reaction.

nature of radioactivity
- ability to write simple equation of

nuclear reaction
- the ability to predict the impact of radioactive decay on the number of protons, neutrons, and nucleons in the nucleus

element is radioactive?
How to determine whether a nucleus is

stable or not?

is commonly referred to as the Band (or Belt) of

Stability and describe it.

or neutron:

marks)

isotope is reached. Write the nuclear reaction for each

of the 11 steps in the decay of Th-238 with each product becoming the reactant of the next decay. What is the final stable isotope?

Step 1: Alpha decay
Step 2: Beta decay
Step 3: Beta decay
Step 4: Alpha decay
Step 5: Alpha decay
Step 6: Alpha decay
Step 7: Alpha decay
Step 8: Beta decay
Step 9: Beta decay
Step 10: Alpha decay
Step 11: Beta decay