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15-10-2020
Chemistry

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Which pair of symbols represents nuclei with the same number of neutrons?
A. 56 Co and 580
B. 57Co and 58Ni
c. 57Fe and 58 Ni
D. 57Mn and 57Fe

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ysabelfranceska ysabelfranceska

15-10-2020

Answer:

B

Explanation:

Mass number = number of neutrons + number of protons

Atomic number is the number of protons in the nucleus.

58Ni : 58 is the number of neutrons + number of protons

atomic number of Ni is 28. Thus, 58 -28 = 30 neutrons

57Co ; 57 is the number of neutrons + number of protons

number of Co is 27. Thus, 57 – 27 = 30 neutrons

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