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OpenStudy (anonymous):
An atom of copper (Cu) has a mass number of 63 and an atomic number of 29. How many protons does it have? A. 29 B. 34 C. 63 D. 92
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OpenStudy (anonymous):
@stephanos100
OpenStudy (anonymous):
@xo.A
OpenStudy (anonymous):
A?
OpenStudy (anonymous):
Yes A. is right (:
OpenStudy (anonymous):
thanks <3
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OpenStudy (anonymous):
How many elements occur naturally? A. 6 B. 25 C. 90 D. 118
OpenStudy (anonymous):
C?
OpenStudy (anonymous):
Na-23 has 11 protons. How many neutrons does it have? A. 11 B. 12 C. 23 D. 34
OpenStudy (anonymous):
B?
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