question

Orbitals of equal energy are each occupied by one electron before any is occupied by a second electron is a statement of

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Hund's rule

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A 3-dimensional region around a nucleus where an electron nay be found is called a(n)

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Orbital

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The major difference between a 1s and a 2s orbital is that

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The 2s orbital is at higher energy than the 1s orbital

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The letter designation for the first 4 sublevels w/max. # of electrons that can be accommodated in each sublevel are

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s:2, p:6, d:10, and f:14

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Which of the following lists atomic orbitals in the correct order they're filled in by energy?

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1s2s2p3s3p4s3d4p5s4d5p6s4f5d6p7s5f6d7p

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What is removed when the ionization energy is supplied to an atom of an element?

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An electron

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For an electron in an atom to change from the ground state to an excited state,

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Energy must be absorded

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How many electrons are needed to completely fill the fourth energy level?

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32

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How many electrons are needed to completely fill the fifth energy level?

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32

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Argon, Krypton, and Xenon are

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Noble gases

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Fluorine, Chlorine, and Iodine are

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Halogens

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Nobelium, Uranium, and Actinium are

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Actinides

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Europium, Ytterbium, Neodymium, and Lanthanum are

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Lanthanides

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Hydrogen, Lithium, Sodium, and Potassium are

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Alkali metals

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Beryllium, Calcium, and Strontium are

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Alkaline Earth Metals

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To which block do the actinide elements belong to

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F

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To which block do the lanthanide elements belong to

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F

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To which block both alkali metals, alkaline earth metals and Helium belong to

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S

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To which block do the transition metals belong to

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D

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To which block do the noble gases, other nonmetals, and a considerable amount of the poor metals belong to

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P

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Hydrogen can be placed separately from other elements on the periodic table because it

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Has many unique properties

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Elements in a group or column in the periodic table can be expected to have similar

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Properties

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No 2 electrons in the same atom can have the same 4 quantum #s. This statement is

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Always true

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The element having the greatest electronegativity is

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Flourine

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The most reactive group of nonmetals is the

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Halogens

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The most reactive group of metals is the

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Actinides

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In nature, alkali metals occur as

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Compounds

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Which model of the atom explains the orbitals of electrons as waves?

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The Quantum Model

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A horizontal row of blocks in the periodic table is called a(n)

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Period

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The vertical rows in the periodic table are called

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Groups

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The set of orbitals that are dumbbell shaped and directed along the x. y and z axes are--?--orbitals

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P

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Valence electrons are those s and p shaped electrons

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In the highest energy level

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The main energy levels of an atom are indicated by the__?__quantum #

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Principle

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The statement that an electron occupies the lowest available energy orbital is

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Aufbau's Principle

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On the periodic table, as you move left to right in Period 4 from gallium-bromine, atomic radii

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Generally Decrease

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When an electron is acquired by a neutral atom, the energy change is called

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Electron Affinity

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The first periodic table was arranged by

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Mendeleev

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Today's periodic table is arranged by

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Atomic #

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The electron configuration 1s2 2s2 2p6 3s2 3p1 represents which element

answer

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