Topic 3.2 Periodicity Physical Properties
... The Effective Nuclear Charge is the ratio protons to electrons. The greater the ratio, the smaller radius will be relative to it’s neutral state ...
... The Effective Nuclear Charge is the ratio protons to electrons. The greater the ratio, the smaller radius will be relative to it’s neutral state ...
Chapter 2 Atoms, Molecules and Ions
... Periods: The horizontal rows of elements in the periodic table are called periods. First period: horizontal row one contains H and He Second period: row two contains Li through Ne Letters in the boxes are the symbols for the elements Abbreviations are based on the current element names or the origin ...
... Periods: The horizontal rows of elements in the periodic table are called periods. First period: horizontal row one contains H and He Second period: row two contains Li through Ne Letters in the boxes are the symbols for the elements Abbreviations are based on the current element names or the origin ...
Agenda/To Do - Perry Local Schools
... C. Metalloids- form a zig zag line splitting the metals and non-metals ...
... C. Metalloids- form a zig zag line splitting the metals and non-metals ...
Describe the Periodic Table
... Describe the Periodic Table Elements have different atomic masses - the number of protons plus neutrons increases up the table. 0 Rows - elements of each row have the same number of energy levels (shells). 0 Columns - elements have the same number of electrons in the outermost energy level or shell ...
... Describe the Periodic Table Elements have different atomic masses - the number of protons plus neutrons increases up the table. 0 Rows - elements of each row have the same number of energy levels (shells). 0 Columns - elements have the same number of electrons in the outermost energy level or shell ...
Chapter 4 Structure of the Atom
... 5. Atoms cannot be subdivided, created, or destroyed when they are combined, separated, or rearranged in chemical reactions. ...
... 5. Atoms cannot be subdivided, created, or destroyed when they are combined, separated, or rearranged in chemical reactions. ...
Dimitri Mendeleev- The father of the modern periodic table. Russian
... • Any of the elements in the far right group (group 8) of the periodic table, including helium, neon, argon, krypton, xenon, and radon, which are monatomic and with limited exceptions chemically inert and do not bond with elements because their valence shell is full. ...
... • Any of the elements in the far right group (group 8) of the periodic table, including helium, neon, argon, krypton, xenon, and radon, which are monatomic and with limited exceptions chemically inert and do not bond with elements because their valence shell is full. ...
The Discovery of the Nuclear Atom: Rutherford (1911)
... scientists tended to think of atoms to consist of negatively-charged electrons within a posively charged medium, sometimes referred to as the ‘plum pudding’ model. For example the following diagrams illustrate our current understanding of the atomic structure of Lithium and the one suggested by the ...
... scientists tended to think of atoms to consist of negatively-charged electrons within a posively charged medium, sometimes referred to as the ‘plum pudding’ model. For example the following diagrams illustrate our current understanding of the atomic structure of Lithium and the one suggested by the ...
UNIT 1: THE ATOM
... Magnesium has an electron configuration of 2-8-2 in the ground state. A configuration 0f 2-7-3 would be in the excited state because the second energy is not completely filed because it holds 8 electrons. 15. Valence electrons are electrons in the outermost energy level. All atoms in the same group ...
... Magnesium has an electron configuration of 2-8-2 in the ground state. A configuration 0f 2-7-3 would be in the excited state because the second energy is not completely filed because it holds 8 electrons. 15. Valence electrons are electrons in the outermost energy level. All atoms in the same group ...
Exam Review
... a. What determines the location of an electron in the electron cloud? How many energy levels are present. Electrons fill the energy levels in order (2-8-8-18) b. How many electrons can be found in the first energy level of an atom? 2 c. How many electrons can be found in the second energy level of a ...
... a. What determines the location of an electron in the electron cloud? How many energy levels are present. Electrons fill the energy levels in order (2-8-8-18) b. How many electrons can be found in the first energy level of an atom? 2 c. How many electrons can be found in the second energy level of a ...
Unit 3 Notes - Holland Public Schools
... *NOTE: no protons or neutrons yet * Problem with Rutherford’s Model – Where are the electrons? He didn’t have a good answer for this D. Niels Bohr (1913) - electrons are in energy levels; based his concept on Quantam Theory and bright-line spectra for hydrogen 1) Quantam Theory – Max Planck (1900) – ...
... *NOTE: no protons or neutrons yet * Problem with Rutherford’s Model – Where are the electrons? He didn’t have a good answer for this D. Niels Bohr (1913) - electrons are in energy levels; based his concept on Quantam Theory and bright-line spectra for hydrogen 1) Quantam Theory – Max Planck (1900) – ...
John Dalton, who lived in the late 18th century and the early 19th
... his later research, Becquerel discovered that uranium emitted an unknown form of energy, and he conducted a series of experiments on it. He wrapped uranium salts in photographic paper and placed the sample in his desk drawer, away from any other source of light, and yet the uranium salts still showe ...
... his later research, Becquerel discovered that uranium emitted an unknown form of energy, and he conducted a series of experiments on it. He wrapped uranium salts in photographic paper and placed the sample in his desk drawer, away from any other source of light, and yet the uranium salts still showe ...
Atomic terms Example: Helium has an atomic number of 2. Every
... 35.45 amu (Natural chlorine is mostly chlorine-35) ...
... 35.45 amu (Natural chlorine is mostly chlorine-35) ...
periodic-trends_atomic-and-ionic-radii
... The electronegativity decreases as you go down a group. This is due to the shielding effect where electrons in lower energy levels shield the positive charge of the nucleus from outer electrons resulting in those outer electrons not being as tightly bound to the atom. Electronegativity increases as ...
... The electronegativity decreases as you go down a group. This is due to the shielding effect where electrons in lower energy levels shield the positive charge of the nucleus from outer electrons resulting in those outer electrons not being as tightly bound to the atom. Electronegativity increases as ...
Perioidicty Slide Show 2011
... The strength of the attraction between the nucleus and the outermost electrons helps determines the atomic radius. The stronger the attraction, the smaller the size of the atom. The weaker the attraction (such as from shielding), the larger the atom or ion. ...
... The strength of the attraction between the nucleus and the outermost electrons helps determines the atomic radius. The stronger the attraction, the smaller the size of the atom. The weaker the attraction (such as from shielding), the larger the atom or ion. ...
atomic theory of matter
... We can not know the exact location of an electron. Any effort to do so, will change the position. We can only figure the probability of finding it in a certain region. ...
... We can not know the exact location of an electron. Any effort to do so, will change the position. We can only figure the probability of finding it in a certain region. ...
chapter 4: chemical foundations
... Aristotle (384-321 B.C.): accepted Empedocles idea and added a fifth element, heavenly ether, which is perfect, eternal, and incorruptible. This idea of only five basic elements was accepted for over 2000 years, until Dalton’s modern theory of atoms in the 1800s. In 1661 Robert Boyle (1627-1691), an ...
... Aristotle (384-321 B.C.): accepted Empedocles idea and added a fifth element, heavenly ether, which is perfect, eternal, and incorruptible. This idea of only five basic elements was accepted for over 2000 years, until Dalton’s modern theory of atoms in the 1800s. In 1661 Robert Boyle (1627-1691), an ...
Radioactive Isotopes and Nuclear Equations
... Atoms are composed of three subatomic particles: protons, neutrons and electrons. Protons and neutrons are found in the nucleus of an atom. The total number of protons and neutrons determines an atom’‛s mass. The number of protons defines the element. Some nuclei are unstable, so they decompose (or ...
... Atoms are composed of three subatomic particles: protons, neutrons and electrons. Protons and neutrons are found in the nucleus of an atom. The total number of protons and neutrons determines an atom’‛s mass. The number of protons defines the element. Some nuclei are unstable, so they decompose (or ...
Atoms and Elements
... • Atoms of the same element that have a different number of neutrons in the nucleus are called isotopes. • Isotopes have the same atomic number but different mass numbers. – The amount of each isotope present in nature is called its abundance ...
... • Atoms of the same element that have a different number of neutrons in the nucleus are called isotopes. • Isotopes have the same atomic number but different mass numbers. – The amount of each isotope present in nature is called its abundance ...
Name: Period:______ Date: CHEMISTRY Chapter 3 AND Nuclear
... 1. Made a mental model of the atom by thinking about repeatedly cutting a piece of gold in half until he reached a basic particle that could no longer be cut in half and still be gold; he called the smallest particle atomos; Greek philosopher. 2. The positive particle in the nucleus of an atom. 3. T ...
... 1. Made a mental model of the atom by thinking about repeatedly cutting a piece of gold in half until he reached a basic particle that could no longer be cut in half and still be gold; he called the smallest particle atomos; Greek philosopher. 2. The positive particle in the nucleus of an atom. 3. T ...