Periodic table/periodicity
Who first published the classification of the elements that is the basis of our periodic table today?
Dmitri Mendeleev
How many electrons fit in each shell around an atom?
The first shell (closest to the nucleus) can hold two electrons. The second shell can hold 8 electrons. The third shell can hold 32 electrons.
A _______ bond is a bond where atoms share valence electrons
Covalent
A substance of phosphorus (P) and oxygen (O) is found to have a mole ratio of 0.4 moles of P for every mole of O. The simplest formula for this substance is:
P2O5
What is the molar mass of Sodium Chloride
58.44g/mol
What is the periodic law?
"When elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties.
How do I find the number of protons, electrons and neutrons that are in an atom of an element?
The number of electrons in a neutral atom is equal to the number of protons
Covalent bonds always form between nonmetals and ____________.
Nonmetals
How many grams of oxygen are in one mole of calcium carbonate, CaCO3?The atomic mass of O = 16 amu.
48 grams
How many moles are in 16 grams of O2?
0.5 moles
how many transition elements are their?
38
How do I read an electron configuration table?
The tiny superscripts say how many electrons live in each orbital, the letters represent the orbitals that are available, and the big numbers say which energy level the orbitals are found in
When electrons cannot be gained or lost, they are
Shared
A compound with molecular formula Fe2(SO4)3 would be called:
iron(III) sulfate
How can I calculate the mole?
divide the mass of the material by its molar mass
What 3 elements are known as the coinage metals?
Gold , Silver and Copper metals.
How do the subatomic particles of an atom help identify each element?
The atomic number
An ion is ____.
An atom which has lost or gained electrons
Copper sulphate crystals are actually pentahydrate crystals of copper sulphate. Copper sulphate pentahydrate has the following molecular formula:
CuSO4.5H2O
How to calculate the mole percent?
Mole percent = mole fraction × 100
what is group one called
alkali metals
What is atomic structure?
a nucleus and at least one particle called an electron
Ionic bond is formed between atoms of ________ and _______.
Metals and non-metals
State True or False. The chemical formula is the same as a chemical structure or molecular formula.
False
To three significant digits, what is the mass percentage of iron in the compound Fe2O3?
69.9% Fe