Isotopes and Ions
Mole Calculations
Empirical Formulas & Percent Composition
Electron Configurations & PES
Periodic Trends
100
The number of isotopes of this element.
What is 2?
100
The molar mass of CH4
What is 16.04 g/mol ?
100
The empirical formula for butane, C4H10
What is C2H5 ?
100
The number of valence electrons in an atom with this electron configuration:
[Ar]4s23d104p5
What is 7?
100
This element has 6 valence electrons in energy level 4.
Se
200
The mass of the most abundant isotope of this element
What is 11?
200
The number of molecules in 3.0 moles of N2
What is 1.8 x 1024 molecules?
200
A compound has a 3.5 moles of Oxygen for every mole of Chromium. What is the empirical formula of this compound?
Cr2O7
200
This is the full electron configuration of Aluminum (Al).
1s22s22p63s23p1
200
This element is the least reactive of the alkaline earth metals.
What is Be?
300
This is the particle that makes isotopes different from one another.
What is neutron?
300
The number of grams in 2.5 moles of H2O
What is 45 grams?
300
When doing an empirical formulas problem starting with grams of each element this is the first conversion that must be done.
What is convert to moles?
300
The electrons of an atom of this element are shown in this PES.
P
300
This halogen has the largest ionization energy.
What is F?
400
This is the charge of an atom with 12 protons, 12 neutrons and 10 electrons.
What is +2?
400
The number of grams in 9.20 x 1024 atoms of Fe
What is 853 grams?
400
When a sample of NaCl is contaminated with KCl what this effect would be seen in the percent chlorine.
What is a decrease?
400
The number of valence electrons in an atom in group 16 period 4.
What is 6?
400
This phenomenon is responsible for all of the trends within a group on the periodic table.
What is the shielding effect?
500
The average atomic mass of an element containing isotopes in the following percentages:
25% 444 amu
75% 446 amu
What is 445.5 amu?
500
The number of molecules in 75.0 grams of CO2
What is 1.03 x 1024 molecules?
500
The approximate percent of H in H2O.
What is 11%
500
This is the number of unpaired electrons in an atom of Mn.
5
500
An element in this group on the periodic table would have a big jump between the first and second ionization energies.
What is group 1 (alkali metals)?