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Chemistry Final 1

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Mass number - atomic number is equal to the number of what particle?
neutrons
Number of protons + number of neutrons=?
mass of atom
Unique whole number associated with each element?
Atomic number
The atomic number is equal to what?
the number of protons
In a neutral atom the number of protons + the number of _____ is equal.
Electron
atomic number of uranium
92
number of protons in uranium
92
²³⁵U. number of neutrons?
143
U²⁺. number of electrons?
90
²³⁸U. number of neutrons?
146
the electron was discovered by?
Thompson
the experiment that revealed electrons (Rutherford)?
oil droplets
who discovered radioactivity?
Beckerel
2 atoms are isotopes if they contain...
the same number of protons and electrons
light has properties of....
both particles and waves
what is not a form of electromagnetic radiation?
sound waves
which wave property says how often a wave oscillate?
frequency
symbol for wavelength?
λ
quanta are fundamental pieces of?
energy
who proposed the idea of quanta?
Plank
Which person explained how quantization could be used to account for line spectra of elements?
Bohr
Wavelength is defined as the distance between..
successive crests of a wave
who explained the photoelectric effect?
Einstein
who explained matter?
de Broglie
the quantum mechanical model treats atoms by..
electrons as a wave of quantized energy
Under what conditions can 2 electrons occupy the same orbital?
Opposite spins
The prop of finding electrons is certain regions of an atom is
Orbitals
When electrons are in the lowest energy level possible they are in the
ground state
Which of the following elements is this:
1s² 2s² 2s³
Nitrogen
Which of the following elements is this:
1s² 2s² 2p⁵
Chlorine
Which of the following elements is this:
1s² 2s² 2p⁶ 3s²
Magnesium
Which of the following elements is this:
1s² 2s² 2p⁶ 3s² 3p²
Silicon
Which of the following elements is this:
1s² 2s² 2p⁶ 3s¹
Sodium
Who discovered the concept of atomic number?
Mosley
Mendeleev arranged the elements in order of increasing
atomic number
The scientist credited with the first periodic table is
Mendeleev
The elements in group one of the Periodic Table is
Alkali Metal
Elements in group 18 are
Nobel gases
Elements in group two are
Alkaline earth metal
Mailability is a characteristic of
metals
What are the elements in group 17?
Helogens
Those electrons that are responsible for an atom's chemical behavior are
valence electrons
Valence electrons in an atom are always
outermost electrons
The second period of the periodic table contains
S and P block
As you move from left to right along the periods the atomic radii
decreases
Mendeleev organized the chemical elements based on their
properties
A horizontal row in the periodic table is called a(n)
period
The periodic law states that
the physical and chemical properties of the elements are functions of their atomic number
an element with the general electron configureation ns² np¹ for its outermost electrons would be in group
13
When a carbon atom is in its ground state, how many electrons does it have in its outermost shell?
4
Light has properties of
waves only