Draw the geometric atomic structure of ${}_{19}^{39}K$ , showing clearly the number of neutrons, number of protons and number of electrons.

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Solution

The subscript denotes the atomic number. Thus potassium is having atomic number 19.
The atomic number is the number of protons in an atom, hence the number of protons= 19.
In an electrically neutral atom, the number of electrons and protons will be the same. Hence the number of electrons= 19.
Superscript denotes the mass number. The mass number is the sum of a number of protons and neutrons.
Hence, number of neutrons=mass number-number of protons= (39-19)= 20.

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Draw the geometric atomic structure of K1939 , showing clearly the number of neutrons, number of protons and number of electrons.

Draw the geometric atomic structure of ${}_{19}^{39}K$ , showing clearly the number of neutrons, number of protons and number of electrons.