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Mole Concept and Avogadro's Number

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Question

From the symbol $_{19} K^{40}$ . Write the distribution of electrons in an atom of potassium.

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Solution

The electronic configuration of potassium $= 1 s^{2}, 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}, 4 s^{1}$ .

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Q. From the symbol

_{17} C l^{35}

, write the distribution of electron in an atom of chlorine.

Q. From the symbol

_{19} K^{40}

, state the atomic number of potassium.

Q. From the symbol

_{19} K^{40}

, state the mass number of potassium.

That distribution of electrons in an atom of potassium is what?

_{19} K^{40}

consist of 0.012% potassium in nature. The human body contains 0.35% potassium
by weight. Calculate the total radioactivity resulting from

_{19} K^{40}

decay in a 75 kg human body. Half life of

_{19} K^{40}

1.3 \times 10^{9}

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