U1 Atomic Structure & Nuclear Chemistry

What is the number of protons that the element in this image contain?

• 14
• 7
• 15
• 18

Which subatomic particles contribute the most to the mass of an atom?

• Protons, Neutrons, Electrons
• Protons only
• Protons and Electrons
• Protons and Neutrons

If an atom has 10 protons, 15 neutrons and 10 electrons, what is its mass number?

• 20

• 10

• 35

• 25

What type of reaction is this?

• Alpha

• Beta

• Gamma

• Positron emission

What type of reaction is this?

• Alpha

• Beta

• Gamma

• Positron emission

What happens to the atomic number during alpha decay?

• The atomic number decreases by 4
• The atomic number increases by 1
• The atomic number decreases by 2.
• The atomic number stays the same.

Balance the following equation:
¹⁴₆C --> ⁰_-1e + ________

• ¹⁴₅B
• ¹⁴₆C
• ¹⁴₇N
• ⁴₂He

What is the mass number for the element in this image?

• 14

• 7

• 15

• 18

What is the atomic number of the original atom?

• 80

• 82

• 84

• 218

What is the resulting atom's mass number?

• 0

• 42

• 20

• 19