Which pair of elements would you expect to exhibit the greatest similarity in their physical and chemical properties?
A) C, N
B) K, Ca
C) H, He
D) Si, P
E) O, S
Correct Answer:
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Q6: Of the choices below, which one is
Q7: Cathode rays are deflected away from a
Q8: An atom of 15N contains neutrons.
A) 22
B)
Q9: Which species has 54 electrons? Q10: Which species has 48 electrons? Q12: Which species below is the nitrate ion? Q13: Which metal does not form cations of Q14: An unknown element is found to have Q15: Vanadium has two naturally occurring isotopes, 50V Q16: _- rays consist of fast- moving electrons.
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