Open Sci Ed 8.5 Lesson 6

1. Based on the numbers of subatomic particles, which of the following will be a positive ion?

• A. Protons=6, Neutrons=6, Electrons =6

• B. Protons=7, Neutrons=6, Electrons =6

• C. Protons=9, Neutrons=10, Electrons =9

• D. Protons=10, Neutrons=11, Electrons =11

 2. A table with information about four elements is provided. Which element contains 22 protons?
A. Sodium
B. Calcium
C. Titanium
D. Magnesium 

• A. Sodium 
• B. Calcium 
• C. Titanium 
• D. Magnesium 

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 3. The reactivity of an element is most greatly influenced by which of the following?

• A. Number of valence electrons
• B. Melting point
• C. Numbers of protons
• D. Atomic mass

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 4. Which of the following correctly describes a proton?

• A. Location: nucleus, Contribution to mass: usually about half, Charge: positive
• B. Location: nucleus, Contribution to mass: virtually none, Charge: positive
• C. Location: outside nucleus, Contribution to mass: usually about half, Charge: positive
• D. Location: nucleus, Contribution to mass: usually about half, Charge: none

5. An atom of Magnesium has 12 protons. How many electrons does the ion of Magnesium have if it has a charge of positive 2 (+2)?

• A. 2

• B. 10

• C. 14

• D. 24

6.Which of these best describes one of the subatomic particles that could be found at location X in the model of an atom shown above?

• A. It has mass but no charge.
• B. It has no mass and a positive charge.
• C. It has a large mass and a negative charge.
• D. It has no mass and an equal number of positive and negative charges.

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7. The three subatomic particles that make up atoms are -

• A. neutrons, protons and ions.

• B. neutrons, electrons and protons

• C. protons, ions and electrons.

• electrons, neutrons and ions.

 8. An element can be identified by its unique number of -

• A. ions 
• B. electrons 
• C. protons 
• D. neutrons

 9. The reactivity of an atom is determined by -

• A. its number of valence electrons. 
• B. the radius of the atom's nucleus. 
• C. its atomic mass of the element. 
• D. the orbital path of its electrons.

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10. Copper's atomic number is 29. This means that copper has -

• A. 29 protons in its nucleus.
• B. 29 atoms in every molecule.
• C. a boiling point of 29° Celsius.
• D. an atomic radius of 29 micrometers.

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