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... increases across a period, decreases down a group Ionization energy – the energy required to remove an electron from an atom increases across a period, decreases down a group Atomic radius – the size of an atom (radius of the electron cloud) decreases across a period, increases down a group Electron ...
... increases across a period, decreases down a group Ionization energy – the energy required to remove an electron from an atom increases across a period, decreases down a group Atomic radius – the size of an atom (radius of the electron cloud) decreases across a period, increases down a group Electron ...
Atomic Structure - Peoria Public Schools
... Ernest Rutherford: Existence of the nucleus, and its relative size Meitner & Fermi: Sustained nuclear fission Ernest Lawrence: The cyclotron and trans-uranium elements ...
... Ernest Rutherford: Existence of the nucleus, and its relative size Meitner & Fermi: Sustained nuclear fission Ernest Lawrence: The cyclotron and trans-uranium elements ...
Atomic History
... • Most of the alpha particles passed straight through the foil, some were slightly deflected, while only a few were deflected by 90° or more • Results indicated that the positive charge was small and dense and the electrons were spread out in empty space. • *Rutherford could not explain how the e ...
... • Most of the alpha particles passed straight through the foil, some were slightly deflected, while only a few were deflected by 90° or more • Results indicated that the positive charge was small and dense and the electrons were spread out in empty space. • *Rutherford could not explain how the e ...
Chapter 1 Notes
... • Early scientists theorized that eventually you would not be able to cut it in half any more. o Only one particle would be left. o They named these particles ‘Atoms’ • Atoms means ‘cannot be divided’ • Scientists could not study this because they lacked the tools to see things this small. ...
... • Early scientists theorized that eventually you would not be able to cut it in half any more. o Only one particle would be left. o They named these particles ‘Atoms’ • Atoms means ‘cannot be divided’ • Scientists could not study this because they lacked the tools to see things this small. ...
Holt Modern Chemistry -
... o alkaline-earth metal -- one of the elements of Group 2 of the periodic table (beryllium, magnesium, calcium, strontium, barium, and radium) o transition element -- one of the metals that can use the inner shell before using the outer shell to bond o main-group element -- an element in the s-block ...
... o alkaline-earth metal -- one of the elements of Group 2 of the periodic table (beryllium, magnesium, calcium, strontium, barium, and radium) o transition element -- one of the metals that can use the inner shell before using the outer shell to bond o main-group element -- an element in the s-block ...
EXPERIMENT
... appear shiny or lustrous are called metals. Metals are usually good conductors of heat and electricity, somewhat soft and ductile, and can be molded into a shape. Some of the metals you will see such as sodium or calcium may have an outer coating of a white oxide formed due to combination with oxyge ...
... appear shiny or lustrous are called metals. Metals are usually good conductors of heat and electricity, somewhat soft and ductile, and can be molded into a shape. Some of the metals you will see such as sodium or calcium may have an outer coating of a white oxide formed due to combination with oxyge ...
Slide 1
... Ernest Rutherford: Existence of the nucleus, and its relative size Meitner & Fermi: Sustained nuclear fission Ernest Lawrence: The cyclotron and trans-uranium elements ...
... Ernest Rutherford: Existence of the nucleus, and its relative size Meitner & Fermi: Sustained nuclear fission Ernest Lawrence: The cyclotron and trans-uranium elements ...
Chapter 4 The structure of the Atom
... Section 4.3 How atoms differ 13. Who stated that the proton is the subatomic particle that identifies an atom from a particular element? Henry Moseley 14. The number or protons in the nucleus is also referred as the Atomic number 15. The atomic number =_____________ and =_________________ 16. What i ...
... Section 4.3 How atoms differ 13. Who stated that the proton is the subatomic particle that identifies an atom from a particular element? Henry Moseley 14. The number or protons in the nucleus is also referred as the Atomic number 15. The atomic number =_____________ and =_________________ 16. What i ...
Chapter 1 Notes: The Science of Chemistry
... o approximately 1800 times smaller than a p+ or n0 o discovered by JJ Thomson- cathode ray experiment Rutherford’s Experiment Ernest Rutherford Proved the existence of a small dense positively charged nucleus Originally thought atoms were solid; experiment ended up proving the opposite See ...
... o approximately 1800 times smaller than a p+ or n0 o discovered by JJ Thomson- cathode ray experiment Rutherford’s Experiment Ernest Rutherford Proved the existence of a small dense positively charged nucleus Originally thought atoms were solid; experiment ended up proving the opposite See ...
Atomic Structure Notes
... This proved that: the atom had a dense but very small positive core the electrons were far away from the nucleus Most of the atom is just EMPTY SPACE! ...
... This proved that: the atom had a dense but very small positive core the electrons were far away from the nucleus Most of the atom is just EMPTY SPACE! ...
The Periodic Law (Unit #5) Study Guide 1. Who is credited with
... 1. Who is credited with developing the first successful periodic table? __Mendeleev_________ 2. This person used atomic _mass_____ and _properties___ of elements to arrange the elements in periodic order. 3. Henry Moseley found that elements in the periodic table fit into patterns better when arrang ...
... 1. Who is credited with developing the first successful periodic table? __Mendeleev_________ 2. This person used atomic _mass_____ and _properties___ of elements to arrange the elements in periodic order. 3. Henry Moseley found that elements in the periodic table fit into patterns better when arrang ...
CHEMISTRY
... The nature of most atoms is that they are LONELY and sometimes AGGRESSIVE! Most atoms team up with or overtake other atoms in an attempt to get the “right” number of electrons. This is how molecules are formed. Only the NOBLE GASSES can exist on their own. ATOMS will switch partners when provoked. T ...
... The nature of most atoms is that they are LONELY and sometimes AGGRESSIVE! Most atoms team up with or overtake other atoms in an attempt to get the “right” number of electrons. This is how molecules are formed. Only the NOBLE GASSES can exist on their own. ATOMS will switch partners when provoked. T ...
At. Theory Timeline - Advanced Placement Chemistry
... theory consisted of the following four postulates: 1. Each element is made up of tiny particles called atoms. 2. The atoms of a given element are identical in average atomic mass and properties; atoms of different elements are different in some fundamental way (or ways). 3. Chemical compounds are fo ...
... theory consisted of the following four postulates: 1. Each element is made up of tiny particles called atoms. 2. The atoms of a given element are identical in average atomic mass and properties; atoms of different elements are different in some fundamental way (or ways). 3. Chemical compounds are fo ...
Chapter 6
... regular pattern, or a periodic pattern. Mendeleev placed the known elements in a table, where he arranged elements into columns with similar properties. ...
... regular pattern, or a periodic pattern. Mendeleev placed the known elements in a table, where he arranged elements into columns with similar properties. ...
Periodic Law
... electron is acquired by a neutral atom When an atom gains an electron easily, a large amount of energy is released (indicated by a high negative number). These elements will have a high electron affinity. ...
... electron is acquired by a neutral atom When an atom gains an electron easily, a large amount of energy is released (indicated by a high negative number). These elements will have a high electron affinity. ...
Models of the atom
... •384-322 B.C. – Aristotle- believed in the four elements of air, earth, water and fire. Aristotle felt that regardless of the number of times you cut a form of matter in half, you would always have a smaller piece of that matter. This view held for 2000 years primarily because Aristotle was the tuto ...
... •384-322 B.C. – Aristotle- believed in the four elements of air, earth, water and fire. Aristotle felt that regardless of the number of times you cut a form of matter in half, you would always have a smaller piece of that matter. This view held for 2000 years primarily because Aristotle was the tuto ...
chemistry - cloudfront.net
... P = gains 3 Which element has similar chemical properties like Si? Why? At Al N C both have four valence electrons (both found in group 14) When electrons absorb energy, what is the result? What color of light has the most energy? What is the probability map for an electron called? an orbita ...
... P = gains 3 Which element has similar chemical properties like Si? Why? At Al N C both have four valence electrons (both found in group 14) When electrons absorb energy, what is the result? What color of light has the most energy? What is the probability map for an electron called? an orbita ...
Atomic Structure Guided Notes
... have different numbers of neutrons. Atoms that differ in this way are called _______________________ The isotopes of an element are virtually identical in their _______________________ reactions because they have the same number of _______________________ and the same number of _____________________ ...
... have different numbers of neutrons. Atoms that differ in this way are called _______________________ The isotopes of an element are virtually identical in their _______________________ reactions because they have the same number of _______________________ and the same number of _____________________ ...
Unit 2 Outline
... Periods and groups are named by numbering columns and rows. Some elements, such as oxygen, hydrogen, fluorine, chlorine, bromine, and nitrogen, naturally occur as diatomic molecules. Electronegativity increases from left to right within a period and decreases from top to bottom within a group. ...
... Periods and groups are named by numbering columns and rows. Some elements, such as oxygen, hydrogen, fluorine, chlorine, bromine, and nitrogen, naturally occur as diatomic molecules. Electronegativity increases from left to right within a period and decreases from top to bottom within a group. ...
1st Semester Review - Moore Public Schools
... Be able to write properly balanced chemical formulas using the ion-charge method, always placing the positive (cation) first in the formula. 32. Describe the rules for naming compounds ...
... Be able to write properly balanced chemical formulas using the ion-charge method, always placing the positive (cation) first in the formula. 32. Describe the rules for naming compounds ...
Classifying Matter and the Periodic Table
... produces smaller and smaller groups of atoms, until you come to a single gold atom. Dividing that atom into two parts produces fragments that no longer have the properties of gold. ...
... produces smaller and smaller groups of atoms, until you come to a single gold atom. Dividing that atom into two parts produces fragments that no longer have the properties of gold. ...
Honors Review Unit 2 answers
... Used an “oil drop” experiment to discover the charge and mass of an electron. ___Millikan__ Proposed the “Plum Pudding” model of the atom. _____Thomson________ Used the word “atomos” to describe matter. _____Democritos________ Called the “Father of Modern Chemistry”. ___Lavoisier_________ Discovered ...
... Used an “oil drop” experiment to discover the charge and mass of an electron. ___Millikan__ Proposed the “Plum Pudding” model of the atom. _____Thomson________ Used the word “atomos” to describe matter. _____Democritos________ Called the “Father of Modern Chemistry”. ___Lavoisier_________ Discovered ...