When potassium salts are burned, they produce a bright violet flame. This color can be used in flame tests to confirm the presence of $\mathrm{K}$ in a given substance. The atomic radius of $\mathrm{K}$ is $275 \mathrm{pm}$.
Burning
potassium
chloride

Given this information, which of the following metals could have an atomic radius of $340 \mathrm{pm}$ ?

Choose 1 answer:
(A) $\mathrm{Na}$
(B) $\mathrm{Ca}$
(c) $\mathrm{Cs}$

Question

When potassium salts are burned, they produce a bright violet flame. This color can be used in flame tests to confirm the presence of $\mathrm{K}$ in a given substance. The atomic radius of $\mathrm{K}$ is $275 \mathrm{pm}$.
Burning
potassium
chloride

Given this information, which of the following metals could have an atomic radius of $340 \mathrm{pm}$ ?

Choose 1 answer:
(A) $\mathrm{Na}$
(B) $\mathrm{Ca}$
(c) $\mathrm{Cs}$

Accepted Answer

***C*** ∻Key Concept∻ ⚹Atomic Radius Trends⚹ ∻Explanation∻ ⚹Cesium (Cs) has a larger atomic radius compared to sodium (Na) and calcium (Ca) due to its position further down the periodic table, resulting in a greater number of electron shells.⚹◊What is the relationship between the atomic radius of an element and the color it produces when burned in a flame test?⍭ Generate me a similar question◊

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