Periodic Table
What halogen has 10 neutrons?
F
What is the least electronegative element?
Fr
What kind of bond holds together PCl3?
ionic, polar covalent, or nonpolar covalent?
nonpolar covalent
Find the average atomic mass for a sample that contains 99% of an isotope that has a mass of 12, and the rest has a mass of 13. Round to the nearest 0.01 amu.
12.01 amu
What is the symbol of a metal that touches the staircase?
Al, Ge, Sb, or Po are acceptable
How many total electrons does krypton have? How many valence electrons does krypton have?
36, 8
What is the force between different molecules of HCl?
Choose between: dipole-dipole, London dispersion, or hydrogen bonding.
Dipole-dipole
What kind of reaction is this?
2 K2S -> 4 K + S2
Combustion, synthesis, decomposition, single replacement, or double replacement
Decomposition
What is the symbol of the element in the 3rd period and has an oxidation number of -1?
Cl
How many protons are found in Li? How many neutrons?
3, 4
Balance the following equation.
____ S2 + _____ Al -> _____ Al2S3
When atoms give off light, the atom's electrons go from the excited state to the ________ state.
Ground
What element has the highest electronegativity?
Fr, F, H or At?
F
What is the formula for selenium tetrabromide?
SeBr4
What kind of bond holds together HF?
Ionic, polar covalent, or nonpolar covalent?
Polar covalent (covalent = 2 nonmetals, polar = starts with H)
Find the density of an object that has a mass of 10.12 grams and whose water displacement measurements are 5.41 mL and 12.90 mL. Round to the nearest 0.01 g/mL.
1.35 g/mL
What alkali metal has the largest atomic radius?
Fr
What is the formula for chromium (II) phosphide?
Cr3P2
What type of force acts between molecules of HBr?
Choose between: dipole-dipole, london dispersion, or hydrogen bonding
dipole-dipole
(london dispersion if its nonpolar covalent, dipole-dipole for polar covalent unless its hydrogen bonding, hydrogen bonding if you see H with N, O, or F specifically)
What is the average atomic mass that contains 81% of an isotope with a mass of 11, while the rest of the isotopes have a mass of 10. What is the average atomic mass? Please round to 0.01 amu.
10.81 amu