A Certain Neutral Atom Has an Atomic Number = 19

question 48

Multiple Choice

A certain neutral atom has an atomic number = 19 and a mass number = 39.Which of the following are correct?
1) It has 19 electrons.
2) It has 20 protons.
3) It has 20 neutrons.
4) It has a total of 39 protons and electrons.

• A) 1 and 4 are correct
• B) 1 and 3 are correct
• C) 2 and 4 are correct
• D) 2 and 3 are correct
• E) 1, 3, and 4 are correct

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