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2. Atoms & Elements - Part 1 of 4

2. Atoms & Elements / Isotopes / Problem 6

The number of neutrons (n) and protons (p) for four isotopes is given in the table. What are their symbols?

A

(i) ⁸⁴₃₇Rb
(ii) ⁸⁵₃₇Rb
(iii) ⁸⁷₃₈Sr
(iv) ⁸⁸₃₈Sr

B

(i) ¹²¹₈₄Po
(ii) ¹²²₈₅At
(iii) ¹²⁵₈₇Fr
(iv) ¹²⁶₈₈Ra

C

(i) ⁸⁴₃₄Po
(ii) ⁸⁵₃₅At
(iii) ⁸⁷₃₇Fr
(iv) ⁸⁸₃₈Ra

D

(i) ¹²¹₃₇Rb
(ii) ¹²²₃₇Rb
(iii) ¹²⁵₃₈Sr
(iv) ¹²⁶₃₈Sr

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