Unit 2 Test (English version)

Front

What happens to the atomic number of an element when it undergoes nuclear decay by gamma rays?

Back

The atomic number remains the same.

Front

What is the missing element in the equation: 85^209At = ___ + 2^4He?

Back

83^205Bi

Front

How is mass number defined?

Back

Mass number = # protons + # neutrons

Front

What happens to an atom's radius as you move down the periodic table?

Back

The atom's radius gets bigger because the atoms have more energy levels.

Front

What type of reaction occurs in the sun?

Back

Nuclear fusion.

Front

What is nuclear fission?

Back

Nuclear fission is the process of splitting a heavy nucleus into smaller nuclei, releasing energy.

Front

What is nuclear fusion?

Back

Nuclear fusion is the process of combining light nuclei to form a heavier nucleus, releasing energy.

Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom.

Front

What is the charge of an electron?

Back

Electrons have a negative charge.