Atomic structure Questions and Answers

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 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 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. C. The model shows the actual size of each atom correctly. D. The model shows the relative sizes of the atoms to each other.

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 radiation, and calculate the energy (in joules) of a single photon associated with this frequency. Enter your answers in scientific notation. (a) Wavelength of the radiation: (b) Energy (in joules) of a single photon:

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.

You used a green dye for the spectroscopy. What color wavelength was absorbed by the light? green violet yellow red

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?

A 5.70 g sample of candy is placed in a bomb calorimeter and combusts in excess oxygen. The temperature of the calorimeter increases from 20.81°C to 23.65°C. The heat capacity of the calorimeter is 29.10 kJ/K. How many nutritional Calories are there per gram of the candy?

Consider the balanced reaction below: Pb(NO3)2 + Na2 CrO4 → PbCrO4 + 2NaNO3 How many moles of sodium nitrate, NaNO3, would be produced from the complete reaction of 253 g sodium chromate, Na2CrO4?

Consider the following molecule. Draw the Lewis Structure and use the drawing to fill in the following chart: PF6- Number of Valence e (Whole Structure) Areas of e Density Around Central Atom: Electronic Geometry: # Bonding Areas (Central Atom): # Non-Bonding Areas (Central Atom): Molecular Geometry Bond Angles (Central Atom) Polar Bonds? Polar Molecule? Any Pi (Double/Triple) Bonds? Draw your Lewis Dot:

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?

Which statement best describes the bonds in NH4CI? All bonds are ionic All bonds are covalent The NH4Cl bond is covalent and the N-H bonds are ionic. The NH4Cl bond is ionic and the N-H bonds are covalent.

When an electron in an atom moves from the ground energy state to an excited state energy is absorbed by the atom energy is emitted by the atom the atom becomes negatively charged the electron moves closer to the nucleus

Microwave ovens emit microwave energy with a wavelength of 12.7 cm. What is the energy of exactly one photon of this microwave radiation?

What is the correct name for Ca3N₂? calcium nitrogen calcium nitride calcium nitrite calcium nitrate

Which of the following molecules is polar? CCI4 SO3 H2S CO₂