ESAT (Engineering and Science Admissions Test) · Chemistry

Atomic structure

6 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 6 questions

A particle has $17$ protons, $18$ neutrons and $18$ electrons. Which description is correct?
Magnesium has isotopes $^{24} Mg$ ( $79%$ ), $^{25} Mg$ ( $10%$ ) and $^{26} Mg$ ( $11%$ ). What is its relative atomic mass to $1$ decimal place?
How many neutrons are in an atom of $_{92}^{238} U$ ?
Chlorine has two isotopes: $^{35} Cl$ ( $75%$ ) and $^{37} Cl$ ( $25%$ ). What is the relative atomic mass of chlorine?
What is the electronic configuration of a calcium ion, $Ca^{2 +}$ (atomic number $20$ )?
Which pair of species has the same number of electrons?

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