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Chapter 4
The Modern Model of the Atom
16
Chemistry
Undergraduate 1
02/20/2019

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Term
A __________ is an element that tends to gain valence electron in chemical reactions, becoming an _____ in the process.
Definition
nonmetal, anion
Term
A _____ is an element that tends to lose its valence electrons in chemical reaction, becoming a _____ in the process.
Definition
metal, cation
Term
For elements in groups labeled A in the periodic table (IA, IIA, etc.), the number of _______ _______ corresponds to the _____ number.
Definition
valence electrons, group
Term
Period number of an element is equal to the number of total ______ that contain electrons in the atom.
Definition
shells
Term
Each shell can hold a maximum of ___ electrons.
Definition
2n2
Term
The ______ the shell, the more electrons it can hold.
Definition
larger
Term
c
Definition
3.00 X 108 m/s (speed of light)
Term
h
Definition
6.626 X 10-34 J • s (Planck’s constant)
Term
λ
Definition
Wavelength of electromagnetic radiation
Term
E
Definition
energy of electromagnetic radiation
Term
E=
Definition
hc / λ
Term
The size of an atom tends to _________ across a period.
Definition
decrease
Term
The size of an atom tends to _________ down a group.
Definition
increase
Term
The ionization energy of an atom generally _________ as you move from left to right across a period.
Definition
increases
Term
As the size of an atom increases, the ionization energy __________.
Definition
decreases
Term
As the size of an atom decreases, the ionization energy __________.
Definition
increases
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