Atomic structure Questions and Answers

Physical Chemistry
Atomic structureWhat 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?

Physical Chemistry
Atomic structureHow many valence electrons do atoms "desire" to have?
What group has this number of valance electrons?
Is this group reactive or non-reactive?

Physical Chemistry
Atomic structureWhich 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.

Physical Chemistry
Atomic structureThe 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:

Physical Chemistry
Atomic structureNi²+
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.

Physical Chemistry
Atomic structureYou used a green dye for the spectroscopy. What color wavelength was absorbed by the light?
green
violet
yellow
red

Physical Chemistry
Atomic structureA 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?

Physical Chemistry
Atomic structureA 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?

Physical Chemistry
Atomic structureConsider 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?

Physical Chemistry
Atomic structureConsider 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:

Physical Chemistry
Atomic structureA 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?

Physical Chemistry
Atomic structureWhich 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.

Physical Chemistry
Atomic structureWhen 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

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

Physical Chemistry
Atomic structureWhat is the correct name for Ca3N₂?
calcium nitrogen
calcium nitride
calcium nitrite
calcium nitrate
