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stupid chemistry stuff that i'll never know

Terms in this set (36)

Linear
180
Trigonal Planar
120
Tetrahedral
109.5
Trigonal Pyramidal
107
Bent
105
Does group 1A lose or gain electrons?
Loses 1
How many electrons does group 2A lose?
Loses 2
Does group 7A lose or gain electrons?
Gains 1
Principal Quantum Number
energy level
1 electron in all before 2 in any
Hund's Rule
electrons enter orbitals of lowest energy first
Aufbau Principle
no more than 2 electrons can occupy an atomic orbital; electrons must have opposite spins
Pauli Exclusion Principle
Who first organized the elements by atomic mass and properties?
Mendeleev
How is the periodic table ordered now and by whom?
Atomic #; Henry Mosely
What model has a 90% probability of finding an electron?
Electron Cloud/Quantum Model
Describe the nucleus.
High density; consists of protons & neutrons
If an electron moves away from the nucleus to an outer level how is energy affected?
Energy increases
Energy required to move from 1 energy level to another
Quantum Leap
tendency for an atom to attract electrons to itself when chemically combined with another element
Electronegativity
Which element has the highest electronegativity?
flourine
Which element has the lowest electronegativity?
francium(idk)
amount of energy needed to remove an electron from an atom
ionization energy
What is different in isotopes?
atomic mass because different # of neutrons
bond formed when a pair of electrons is shared between 2 atoms
single bond
shares 4 electrons (2 pairs)
double bond
shares 6 electrons (3 pairs)
triple bond
How many significant digits are there in 457cm?
3
How many significant digits are there in 2.50mL?
3
How many significant digits are there in 0.005890kg?
4
How many elements exist in nature?
92
How many orbitals does s contain?
1
How many orbitals does p contain?
3
How many orbitals does d contain?
5
How many orbitals does f contain?
7
Round to ________ when adding significant digits.
Least number of places behind decimal point
Round to ________ when multiplying significant digits.
Least number of significant digits
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