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Q: Which two elements are in the same period? A. nitrogen and phosphorus B. cobalt and iridium C. sodium and sulfur D. boron and silicon
A: D. boron and silicon
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User: How does the periodic table arrange the elements? A. in alphabetical order B. by increasing atomic number C. by the date they were discovered D. by how common they are on Earth

User: Which two elements are in the same period? A. nitrogen and phosphorus B. cobalt and iridium C. sodium and sulfur D. boron and silicon

Weegy: D. boron and silicon
Splutt|Points 253|

User: What is another name for the rows of the periodic table? A. groups B. periods C. families D. intervals

User: How many electron energy levels does palladium (Pd) have? A. 5 B. 8 C. 10 D. 46

Weegy: D. 46
shifa saleheen|Points 9492|

User: Why is the value listed for atomic mass for each element on the periodic table not a whole number? A. It is an average. B. It is a measurement error. C. The numbers of protons can vary for an element. D. The number of electrons can vary for an element.

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Asked 2/2/2012 7:50:18 AM
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