The Periodic Table
Three examples of noble gasses
He, Ne, Ar, Kr, Xe, Rn
What differs an isotope from its naturally occurring element?
The number of neutrons
Avogadro's number
6.022 x 1023
The molar mass of methanol, CH3OH
32.0 amu
The name of the group containing Sr
Alkaline Earth Metals
In a neutral atom, what is the number of electrons equal to?
The number of protons / atomic number
Number of atoms in 8.21 g Li
7.12 x 1023 atoms
The mass of 0.15 mol Na
3.4g Na
Location of Nonmetals on the periodic table
Towards the right side of the periodic table
If atom A has 5 neutrons and a mass of 13, what is its atomic number?
8 protons
Number of molecules in 45g NH3
1.59 x 1024
The mass of 2.78 mol CH3Cl
140.36 g CH3Cl (significant figures: 140. g)
The group and period of Se
Group 16, Period 4
33 protons, 42 neutrons, 33 electrons
Number of formula units in 201g PbCrO4
3.75 x 1023 formula units
The mass of 48.1 mol K2CrO4
9.34 x 103 g K2CrO4