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Chemical Change
Chemical Change

... of another subatomic particle. Neutron – subatomic particles with no charge but with a mass nearly equal to that of a proton. ...
10/2/2013 1 10 Modern Atomic Theory and the Periodic Table
10/2/2013 1 10 Modern Atomic Theory and the Periodic Table

... Each orbit is a distinct, discrete (quantized) energy level. When an atom absorbs energy, the electrons can be promoted to higher energy levels. When an atom emits energy, the electrons can decays to a lower energy level. ...
Chapter 10
Chapter 10

... A form of energy that runs a continuum from radio to X-rays, visible light to microwaves. Each form of radiation shares common characteristics: they display wavelike properties and travel at the same speed. Basic Properties of Waves Wavelength (λ): the distance between consecutive peaks (or troughs) ...
Chapter 10
Chapter 10

... Bohr also suggested energy absorbed or emitted by an atom is quantized (has discrete fixed units). Bohr proposed that electrons can orbit the nucleus at different distances. Each orbit is a distinct, discrete (quantized) energy level. When an atom absorbs energy, the electrons can be promoted to hig ...
,ALgor (JoWr z:
,ALgor (JoWr z:

... -. The atomic number (Z) is the number of protons 'in an atom of a chemical element The mass number (A) is the number of protons and neutrons in the nucleus in an atom of a chemical element. ~ A nuclide is an atom with a specific number of protons and neutrons. Nuclides are described by the notation ...
Atoms and the Periodic Table
Atoms and the Periodic Table

... *1. MASS of an ELECTRON is 1,860 times LESS than a PROTON or NEUTRON *2. (e.g.) lithium [Li]: protons = 3+; electrons = 3-; neutrons = 4 = 7 u (or 7 amu) ...
notes - unit 2 - atomic theory_key_2012
notes - unit 2 - atomic theory_key_2012

... working with an ion, add/subtract the proper amount of electrons the last or VALENCE number in the configuration. Example: Oxygen is 2-6 2. Draw a square for the nucleus and notate correct amount of protons and neutrons inside using the letters P and N. For oxygen, it would be P8 and N8. 3. Using ri ...
sample
sample

... iron, have been known for thousands of years. Others have been discovered much more recently. Helium, often used in balloons, was discovered in 1895. Americium, used in smoke alarms, was discovered only in 1944. Scientists continue to discover new elements today. The atomic number (proton number) of ...
The Atom and the Periodic Table
The Atom and the Periodic Table

... 2. Identify each element as a metal, nonmetal, or metalloid using the zigzag line as a reference. 3. Identify an element by its chemical symbol. 4. Identify the groups and periods of the periodic table. 5. Describe how chemical properties of elements are similar in the same group. 6. Label each grou ...
Atomic Model Unit Plan with SCTS
Atomic Model Unit Plan with SCTS

... and hydrogen, essential elements of living matter. When the elements are listed in order by the masses of their atoms, similar sequences of properties appear over and over again in the list. - Each atom is composed of a central, positively charged nucleus—only a very small fraction of the atom's vol ...
Chapter 4, 5, 6 - Campbell County Schools
Chapter 4, 5, 6 - Campbell County Schools

... Target 2 - Identify the atomic number and the atomic mass of all elements and explain what they mean. A. All of the elements are listed on the ___________________________ of Elements. B. Elements are different kinds of atoms with a name, symbol, and unique properties. C. The Periodic Table lists the ...
Properties of Atoms
Properties of Atoms

... 4) Atoms of different elements combine in simple whole-number ratios to form chemical compounds 5) In a particular compound, atoms of different elements always combine in the same way 6) All atoms of the same element have the same mass, atoms of diff. elements have diff. masses ...
Unit 3 Notes, Practice, and Review
Unit 3 Notes, Practice, and Review

... 19. The atomic number is unique for every element. It also tells the number of protons in that element. Every element on the periodic table has a unique number of protons. It’s like an element’s Social Security Number. 20. Atomic number is the number of protons and electrons in an atom. To get the n ...
Atoms, Isotopes and Relative Atomic Masses
Atoms, Isotopes and Relative Atomic Masses

... A student neutralised 2.68 g of CaCO3 with 2.50 mol dm–3 nitric acid, HNO3. The equation for this reaction is shown below. CaCO3(s) + 2HNO3(aq) → Ca(NO3)2(aq) + CO2(g) + H2O(l) The student left the solution of calcium nitrate formed to crystallise. Crystals of hydrated calcium nitrate formed contain ...
File
File

... 20. Element whose atoms lose electrons in chemical reactions to become positive ions. 21. Groups 3-12 on the periodic table. 22. Scientist who performed the gold foil experiment, and concluded that an atom must be composed of mostly empty space with a small, dense, positively-charged nucleus. 23. An ...
Chapter 2
Chapter 2

... pair of valence electrons by two atoms • In a covalent bond, the shared electrons count as part of each atom’s valence shell • A molecule consists of two or more atoms held together by covalent bonds Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings ...
Electrons in Atoms - Effingham County Schools
Electrons in Atoms - Effingham County Schools

... Hydrogen has an electron configuration of 1s1, but despite the ns1 configuration, it does not share the same properties as the elements of Group 1 ...
chapter04
chapter04

... more than a couple of dozen noble-gas compounds of all types are known. This group of elements is far less reactive chemically than any other. ...
Table of Contents Chapter 5 Objectives Chapter 5 Mendeleev and
Table of Contents Chapter 5 Objectives Chapter 5 Mendeleev and

... • lithium, sodium, potassium, rubidium, cesium, and francium • In their pure state, all of the alkali metals have a silvery appearance and are soft enough to cut with a knife. ...
The science of chemistry is concerned with the
The science of chemistry is concerned with the

... more than a couple of dozen noble-gas compounds of all types are known. This group of elements is far less reactive chemically than any other. ...
Elements of Chemical Structure and Inorganic Nomenclature
Elements of Chemical Structure and Inorganic Nomenclature

... (a) Atomic number. The atomic number of an atom is equal to the number of protons in the nucleus of the atom. For example, a carbon atom has six protons in its nucleus; therefore, the atomic number of carbon is six. (b) Atomic weight. The atomic weight of an atom is equal to the number of protons in ...
The atom - KCPE-KCSE
The atom - KCPE-KCSE

... Elements consist of one type of atom, but sometimes these atoms can be slightly different. Although atoms of the same element always have the same number of protons, they may have different numbers of neutrons. Atoms that differ in this way are called isotopes. ...
Arrangements of electrons in the orbitals of an atom is called its
Arrangements of electrons in the orbitals of an atom is called its

... of the 4s orbital is very close to the energy of the 3d orbital at potassium. But the energy of the 4s orbital is lower in energy compared to the 3d. So the next electron is placed into the 4s orbital. At calcium the electron is paired. For scandium we might consider whether the electron goes into t ...
Unit PowerPoint
Unit PowerPoint

... What structural characteristics do all oxygen atoms have in common? All oxygen atoms have the same number of protons and electrons. What differences exist between the isotopes of oxygen? The mass number, number of neutrons and mass of each isotope are different. ...
Document
Document

... A chemical symbol is used to represent the atoms that are being bonded. The appropriate number of dots is drawn on the four sides of the chemical symbol to represent the number of valence electrons and “empty spots” in the valence shell of the bonding atoms. Structural formulas are used to represent ...
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