Practice Atomic Number And Mass Number (2.3) - Structure of Atom

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10 questions

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4 questions · about 3 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What does the atomic number represent?
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It's the letter 'Z'.
Question 2.
How do you find the mass number of an atom?
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Think of the formula: A = Z + N.
3Question 3.
What is the atomic number of an atom?
- Number of protons
- Number of neutrons
- Number of electrons
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It's key to identifying the element.
4Question 4.
True or False: The mass number is the sum of protons and electrons.
- True
- False
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Think about what contributes to mass.
Question 5.
An unknown element has an atomic number of 12 and a mass number of 24. Calculate the number of neutrons and determine the element.
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Use the formula for calculating the number of neutrons.
Question 6.
If an element has 20 protons and 22 neutrons, and forms an ion with a +2 charge, what is the new number of electrons?
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Remember how ion charges affect electron count.

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