1. Which of the following best describes an atom?
A) protons and electrons grouped together in a random pattern
B) protons and electrons grouped together in an alternating pattern
C) a core of protons and neutrons surrounded by electrons*
D) a core of electrons and neutrons surrounded by protons
4. When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?
A. The total number of neutrons in the unknown element
B. The total number of particles in the nucleus of the unknown element
C. The number of protons in the nucleus of the unknown element
D. The number of valence electrons in the unknown element*
5. A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher selected for the experiment (use the periodic table)?
A Nitrogen (N)
B Sulfur(S)
C Arsenic (As)
D Silicon (Si)

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  1. Number 5: use the periodic table. which element is in the same family?
    others are correct.

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  2. What are your answers?

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  3. oooppsss! Sorry! I see your answers now : )

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  4. oh sorry my answers for number 5 is C

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  5. I agree that As is the choice to compare with P.

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  6. Thank you

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