Atomic structure Questions and Answers

The half-life of radium-226 is 1600 years. Suppose you have
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The half-life of radium-226 is 1600 years. Suppose you have a 20-mg sample. How long will it take to decay to 7-mg? Round to 4 decimal places.
The wavelength of one line in the emission spectrum of C is
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The wavelength of one line in the emission spectrum of C is 458 nm. What is the energy of one photon with this wavelength? (Hint: h=6.626 x 10^-34 J s
What are valence electrons? How many valence electrons does
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What are valence electrons? How many valence electrons does Na have? How many total electrons does Na have? How many valence electrons does O have? How many total electrons does O have?
How many valence electrons do atoms "desire" to have? What
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How many valence electrons do atoms "desire" to have? What group has this number of valance electrons? Is this group reactive or non-reactive?
Which of these is true for a molecular model like the one
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Which of these is true for a molecular model like the one shown? A. We can always identify the type of each atom based on color. B. The model shows how the various atoms are connected in the molecule.
You used a green dye for the spectroscopy. What color
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You used a green dye for the spectroscopy. What color wavelength was absorbed by the light? green violet yellow red
The blue color of the sky results from the scattering of
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The blue color of the sky results from the scattering of sunlight by molecules in the air. The blue light has a frequency of about 7.23 x 10¹4 Hz. Calculate the wavelength (in nm) associated with this
Ni²+ Express your answers as integers. Enter your answers
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Ni²+ Express your answers as integers. Enter your answers separated by a comma. Np, Ne= S2- Express your answers as integers. Enter your answers separated by a comma.
Dimensional Analysis 2: Molar Concepts: Question 3 One mole
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Dimensional Analysis 2: Molar Concepts: Question 3 One mole of NaCl and one mole of Cl₂ have a mass of 1 gram each contain the same number of molecules have the same mass contain one molecule each
A neutral atom has the following electron configuration:
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A neutral atom has the following electron configuration: 1s²2s²2p 3s²3p 4s² What is the chemical symbol for the atom? How many electrons does the atom have? How many 3s electrons are in the atom?
A neutral atom has the following electron configuration:
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A neutral atom has the following electron configuration: 1s²2s²2p³ What is the chemical symbol for the 0 atom? How many electrons does the atom have? How many 2s electrons are in the atom?
Which of the following molecules is polar? CCI4 SO3 H2S CO₂
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Which of the following molecules is polar? CCI4 SO3 H2S CO₂