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Discovery of Electrons

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Question

From the symbol $_{19} K^{40}$ , state the mass number of potassium.

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Solution

The mass number of potassium $(A) = 40$
the mass number is defined as the total number of protons and neutrons in an atom.

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Similar questions

Q. From the symbol

_{19} K^{40}

, state the atomic number of potassium.

Q. From the symbol

_{19} K^{40}

. Write the distribution of electrons in an atom of potassium.

_{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}

_{99} K^{40}

0.012 %

of potassium in nature. The human body contains

0.35 %

potassium by weight. The total radioactivity resulting from

_{19} K^{40}

decay in a 75 kg human is :
Half life for

_{19} K^{40}

1.3 \times 10^{9}

From the symbol $_{12}^{24} M g,$ state the mass number, the atomic number and electronic configuration of magnesium.

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