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In Biology / High School | 2014-11-30

1. What element has 81 protons in the nuclei of its atoms?

A. Platinum
B. Lead
C. Thallium
D. Uranium

Asked by moniqueparker69

Answer (2)

A little trick i learnt: The atomic number reflects how many electrons there are, and there must be an equal charge. therefore, there are the same amount of protons as there are electrons. so if it has 81 protons, we look for number 81 in the periodic table, Thallium

Answered by Shortcircuit | 2024-06-10

The element with 81 protons is Thallium (Tl). This can be found by consulting the periodic table where Thallium has an atomic number of 81. Thus, the correct choice is C. Thallium.
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Answered by Shortcircuit | 2024-12-26

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