Chemistry Final 2
Why do atoms get larger down a column?
more energy levels
Which of the reactions is a fission reaction?
235/92U + 1/0n -> 137/55 Cs + 96/37 Rb + 3 1/0n
Which of the reactions could result in a chain reaction?
235/92U + 1/0n -> 137/55 Cs + 96/37 Rb + 3 1/0n (fission.)
Which pair of orbitals has the same shape?
2s and 3s
The fourth principle energy level has:
4 sublevels
The atomic radius of F, Br, and I are 64, 114, and 138 pm respectively. From this information estimate a reasonable atomic radius of Cl.
89pm
What is the total number of orbitals in the third principle energy level?
9
Which would have a larger atomic radius, Sulfur or Magnesium?
Magnesium
Which of the following is an alkali metal?
Na
Which of the following is a noble gas?
Ne
The sum of the protons and electrons in an atom equals the ____
charge of the atom
Changing the number of neutrons of an atom changes its
isotope
Which of these elements has physical and chemical properties most similar to Silicon?
lead (Pb)
Why do atoms get smaller across a row?
more protons
Atoms of Uranium-235 and Uranium-238 differ by three:
neutrons
In order to occupy the same orbital, two electrons must have:
opposite spin
The first 3 electrons that enter into p orbital must have:
parallel spin
Which period of the Periodic Table contains more metallic elements than nonmetallic elements?
period 4
the formula 2n^2 represents:
the maximum number of electrons that can occupy an energy level
The atomic number of an atom is:
the number of protons
What is the atomic number of a neutron?
0
Which equation represents positron decay?
11/6C -> 0/+1e + 11/5B
Which group contains a metalloid?
15
The max number of electrons that can occupy the third principle energy level is:
18
Which group in the Periodic Table contains elements that are all gasses at room temperature?
18 (0)
What is the max number of electrons that can occupy one orbital?
2
Which nuclear emission has the greatest mass?
Alpha
Which would be smaller, As or As^3-?
As
Which of the following is an alkaline earth metal?
Ba
Which would be larger, Be or Be^2+?
Be
how do the isotopes Carbon-12 and Carbon-13 differ?
Carbon-12 has 12 neutrons; Carbon-13 has 13 neutrons
Which of the following is a halogen?
F
Which would have a smaller atomic radius, Nitrogen or Antimony?
Nitrogen
Use the periodic table (not any tables in your book) to predict which element has the largest ionization energy?
Oxygen
An alpha particle is
a helium nucleus
Which statement about the periodic table is not true?
The elements at the far left of the table are nonmetals
The mass number of an atom is determined by:
adding the neutrons & protons
Which element is not a transition metal?
aluminum
Which of the following is the least heavy?
an electron
Uranium isotopes ahve different:
atomic masses
Which of the following statements is not true?
atoms of the same element must always have the same mass.
Which orbital corresponds to the transition metals in the periodic table?
d
All the isotopes of a given atom have:
different mass numbers but same atomic number
The subatomic particle that plays the greatest role in determining the physical and chemical properties of an element is the:
electron
Which of these subatomic particle descriptions in incorrect?
electron: negative charge, mass of 0 amu, in nucleus
changing the number of protons of an atom changes its
element
The combination of two atomic nuclei into one, accompanied by a release of energy, is called
fusion
Which type of radioactive decay results in no charge in mass number and atomic number for the starting nucleus?
gamma decay
For which of the properties does Li have a larger value than Potassium?
ionization energy
Which of the following is not a trend that varies systematically in the periodic table?
symbols of elements
