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Unit 2- The Atom
Unit 2- The Atom

... 1. Flip 50 skittles and separate them according to which landed on “S” and which landed  on the blank side.  Record the number of “S.”  To flip the skittles, shake the bag  containing the skittles and pour the contents out on the paper towel.   The skittles that  have landed on the blank side have d ...
Slides Chapter 2 File
Slides Chapter 2 File

... and the percentage of each must be known. ...
Chemistry Chapter 4 (Due October 24) [Test
Chemistry Chapter 4 (Due October 24) [Test

... b. atoms of an element can have different numbers of protons c. atoms are divisible d. all atoms of an element are not identical but they must all have the same mass ____ 16. Why did J. J. Thomson reason that electrons must be a part of the atoms of all elements? a. Cathode rays are negatively-charg ...
Physical Science Chapter 1
Physical Science Chapter 1

... Learn These Facts. Write these in your notebook now. Atomic Number=Number of Protons Number of Electrons = Number of Protons Neutrons = Mass Number – Number of Protons ...
Atoms and orbitals
Atoms and orbitals

... logical that that if one continued this process long enough one would reach a point where one has a piece that cannot be cut further. They called these pieces “atomos” which means indivisible. Later in the early 19th century John Dalton gave this idea a shot in the arm by proposing that matter is co ...
Ch. 5 - Periodic Law
Ch. 5 - Periodic Law

... By 1886, all three elements had been discovered. ...
Biol 1406 notes Ch 2 8thed - Chemistry
Biol 1406 notes Ch 2 8thed - Chemistry

... o There are 92 naturally occurring elements. o Each element has a unique symbol, usually the first one or two letters of its name. Some symbols are derived from Latin or German names.  A compound is a substance that consists of two or more elements in a fixed ratio. o Table salt (sodium chloride or ...
Ch 30 Nuclear Physics
Ch 30 Nuclear Physics

... If daughter product was present when the rock formed, later analysis of the rock will result in an inaccurate parent to daughter ratio. Sometimes it may be possible to determine the amount of daughter nuclide initially present. In order to use radiometric dating techniques at all, the rocks must act ...
apbio ch 2 study guide
apbio ch 2 study guide

... Hydrogen bonds form when a hydrogen atom that is already covalently bonded to one electronegative atom is attracted to another electronegative atom. o In cells, the electronegative partners are typically nitrogen or oxygen. o Hydrogen bonds form because a polar covalent bond leaves the hydrogen atom ...
DO NOW
DO NOW

... Read “The Bohr Model and Valence Electrons” from page 141. Take Cornell Notes, defining the following terms: - Bohr Model ...
Powerpoint slides
Powerpoint slides

... and the percentage of each must be known. • The atomic weight is calculated as the sum of the masses of the individual isotopes for that element. Atomic weight = [(isotope abundance) × (isotope mass)] • The Greek symbol  indicates summing of terms. © 2013 Pearson Education, Inc. ...
nucleus
nucleus

... The number of neutrons can vary, although there are often the same number of neutrons as there are protons. ...
Electron configuration
Electron configuration

... Physicists and chemists use a standard notation to indicate the electron configurations of atoms and molecules. For atoms, the notation consists of a sequence of atomic orbital labels (e.g. for phosphorus the sequence 1s, 2s, 2p, 3s, 3p) with the number of electrons assigned to each orbital (or set ...
CHAPTER 4 TEST
CHAPTER 4 TEST

... Two isotopes of carbon are carbon-12 and carbon-14. These isotopes differ from one another by two protons. _________________________ ...
7 Periodic Properties of the Elements
7 Periodic Properties of the Elements

... Periodic Table; Effective Nuclear Charge ...
CHAPTER-4 STRUCTURE OF THE ATOM
CHAPTER-4 STRUCTURE OF THE ATOM

... 1. If n gives the number of orbit or energy level, then 2n gives the maximum number of electrons possible in a given orbit or energy level. Thus, First orbit or K-shell will have 2 electrons, Second orbit or L-shell will have 8 electrons, Third orbit or M-shell will have 18 electrons. 2. If it is th ...
The Chemical Context of Life by Dr. Ty C.M. Hoffman
The Chemical Context of Life by Dr. Ty C.M. Hoffman

... measure  of  an  atom's  degree  to  which  it  attracts  electrons  is  called  its  electronegativity.  If  a  covalent   bond  is  formed  between  two  atoms  that  have  drastically  different  electronegativities,  the  shared   elect ...
Atoms, Isotopes, and Ions - Science Take-Out
Atoms, Isotopes, and Ions - Science Take-Out

... 1. Use the information on the periodic table to make a model of a hydrogen atom. Then make a hydrogen ion by removing the electron (blue chip) from the model. Draw your ion model. Use a “+” sign for each proton, an “n” for each neutron and a “–” sign for each electron. ...
Atoms, Elements, and Compounds
Atoms, Elements, and Compounds

... compound, wet or dry, exposed to heat or to light. She concluded that the emission of rays by uranium was not the product of a chemical reaction, but could be something built into the very structure of uranium atoms. ...
Chapter 3
Chapter 3

... blocks, of elements according to the subshells that are last to fill, s, p, d, or f. ▶Beginning at the top left corner of the periodic table, the first row contains only two elements, H and He. The 1s subshell is being filled here. ▶The second row begins with two s-block elements (Li and Be) and con ...
periodic classification of elements
periodic classification of elements

... a group. This is due to the fact that when an electron shell is added at each step while moving down in a group the size of the atom increases. The valence electrons become more and more away from the nucleus and the hold of the nucleus on the outermost electrons become less, so, the atom can easily ...
01 Atomic Structure.p65
01 Atomic Structure.p65

... Any group on the periodic table can be considered a ‘family of elements’ as the elements in that group will exhibit similar chemical properties. This is due to each member of the group having the same number of electrons in its outer shell. ...
Chemistry UNIT 3 Test
Chemistry UNIT 3 Test

... d. The nucleus of an atom should contain neutrons. ____ 23. All atoms of the same element have the same ____. a. number of neutrons c. mass numbers b. number of protons d. mass ____ 24. Which of the following was originally a tenet of Dalton's atomic theory, but had to be revised about a century ago ...
chemistry 1
chemistry 1

... very different from those of the elements from which it is formed. For example, sodium is a silver-colored metal. Chlorine is a very reactive, poisonous, greenish gas that was used in battles during World War I. However, the compound sodium chloride--table salt--is a white solid that dissolves easil ...
Atoms and Elements: Are they Related?
Atoms and Elements: Are they Related?

... such a variety of elements? • Can you predict what the other items on the food label are if they are not elements? ...
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