Practice Atomic Number And Mass Number (4.3) - Atomic Structure and Chemical Bonding

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6 sample questions

Question 1.
What is the atomic number of oxygen?
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It's the number of protons.
Question 2.
How many protons are in a nitrogen atom?
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Refer to the atomic number of nitrogen.
3Question 3.
What is the atomic number of sodium?
- 11
- 23
- 12
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Look up the periodic table for sodium.
4Question 4.
The mass number of an element is the total of which two particles?
- Protons and Electrons
- Protons and Neutrons
- Electrons and Neutrons
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Think about what makes up the nucleus.
Question 5.
An element has 20 protons and a mass number of 40. How many neutrons does it have? Discuss how this affects the element's identity.
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Use the relationship of neutrons in terms of mass and atomic number.
Question 6.
If an element has 12 neutrons and an atomic number of 6, can you determine the mass number? What does this tell us about the isotopes of the element?
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Remember that mass number is the sum of protons and neutrons.

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