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# number of protons, neutrons, and electrons

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Parallel Exercises
An electron with a mass of 9.11x10-31 kg has a velocity of 4.3 106 in the innermost orbit of a hydrogen atom. What is the de Broglie Wavelength of the electron?

An electron wave making a standing wave in hydrogen atom has a wavelength of 8.33 x 10-11 m. If the mass of the electron is 9.11x10-31 kg. what is the velocity of the electron according to the de Broglie equation.

Using any reference , write the complete electron configurations for
a. Nitrogen
b. Phosphorus
c. Chlorine

Identify the number of protons, neutrons, and electrons n the following isotopes:
14N, 7Li, 35C, 48 Ca, 63Cu, 230 U
7 3 17 20 29 92

Identify the period and the family in the periodic table for the following elements:
xenon, potassium, chromium, argon, bromine, barium

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#### Solution Preview

Parallel Exercises
An electron with a mass of 9.11x10-31 kg has a velocity of 4.3x106ms-1 in the innermost orbit of a hydrogen atom. What is the de Broglie Wavelength of the electron?
Answer: de Broglie Wavelength of the electron = where h is Plank's constant whose value is given by Therefore,
Wavelength of the electron, λ =
An electron wave making a standing wave in hydrogen atom has a wavelength of 8.33 x 10-11m. If the mass of the electron is 9.11x10-31 kg. what is the velocity of the electron according to the de Broglie equation.
Answer: de Broglie Wavelength of the ...

#### Solution Summary

Identify the period and the family in the periodic table for the following elements: xenon, potassium, chromium, argon, bromine, barium

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