![Ch. 4 Slides](http://s1.studyres.com/store/data/002670496_1-525dfa6ab7e5012412e611bb1bcd380b-300x300.png)
Ch. 4 Slides
... • However, J.J. Thomson discovered electrons, which were much smaller than an atom and negatively charged! • Since atoms are neutral, where’s the ...
... • However, J.J. Thomson discovered electrons, which were much smaller than an atom and negatively charged! • Since atoms are neutral, where’s the ...
Document
... Chemical Changes and Properties of Matter • Chemical change or chemical reaction: • Making a NEW compound • The transformation of one or more atoms or molecules into one or more different molecules ...
... Chemical Changes and Properties of Matter • Chemical change or chemical reaction: • Making a NEW compound • The transformation of one or more atoms or molecules into one or more different molecules ...
ExamView - ev chap 4.tst
... Short Answer (4 PTS EACH: 1 PT FOR CORRECT ANSWER AND 3 PTS FOR CORRECT WORK) You must show your work for full credit. 31. A fictitious element X is composed of 10.0 percent of the isotope 55 X, 20.0 percent of the isotope 56 X, and the rest of the isotope 57 X. Calculate the atomic mass of element ...
... Short Answer (4 PTS EACH: 1 PT FOR CORRECT ANSWER AND 3 PTS FOR CORRECT WORK) You must show your work for full credit. 31. A fictitious element X is composed of 10.0 percent of the isotope 55 X, 20.0 percent of the isotope 56 X, and the rest of the isotope 57 X. Calculate the atomic mass of element ...
Atoms and Elements Class Notes and Class Work
... Modern Periodic Law: States that when elements are arranged in order of increasing atomic number, elements with similar properties occur at regular intervals. (Sometimes every 8 or 18 etc.) i.e. Elements with similar properties occur periodically. The State of Elements: · Most elements are solid at ...
... Modern Periodic Law: States that when elements are arranged in order of increasing atomic number, elements with similar properties occur at regular intervals. (Sometimes every 8 or 18 etc.) i.e. Elements with similar properties occur periodically. The State of Elements: · Most elements are solid at ...
Basic Atomic Structure and Isotope Symbols
... Atomic Number - is the number of protons in the atom. If the atom is neutral the atomic number is also the number of electrons in the atom. Mass Number - is the number of protons + neutrons in the atom. Both of these numbers will be parts of the Isotope Symbol. Both of these numbers are found by cou ...
... Atomic Number - is the number of protons in the atom. If the atom is neutral the atomic number is also the number of electrons in the atom. Mass Number - is the number of protons + neutrons in the atom. Both of these numbers will be parts of the Isotope Symbol. Both of these numbers are found by cou ...
What is Chemistry? Chemistry
... o E.g. Group 17 (Halogens) gain electrons easily and release lots of energy in the process highly reactive How can we determine the charge of an ion? o For some of the elements it is very easy. Elements in groups 1, 2, 13, 14, 15, 16, & 17 will lose or gain electrons so they have the same # as the ...
... o E.g. Group 17 (Halogens) gain electrons easily and release lots of energy in the process highly reactive How can we determine the charge of an ion? o For some of the elements it is very easy. Elements in groups 1, 2, 13, 14, 15, 16, & 17 will lose or gain electrons so they have the same # as the ...
Unit 1
... There Must Be Something Else There! • These questions were answered in 1932 by James Chadwick (a student of Rutherford’s), who discovered another particle in the nucleus, which he called a neutron. – Charge = 0 (no charge). – Relative mass = 1 amu. ...
... There Must Be Something Else There! • These questions were answered in 1932 by James Chadwick (a student of Rutherford’s), who discovered another particle in the nucleus, which he called a neutron. – Charge = 0 (no charge). – Relative mass = 1 amu. ...
Isotopes are atoms of the same element that have different masses
... 7. An isotope of xenon has an atomic number of 54 and contains 77 neutrons. What is the mass of this isotope? 8. What is the mass number of uranium-234? 9. How many neutrons are in uranium 234? 10. Silicon is very important to the semiconductor industry. The three naturally occurring isotopes of sil ...
... 7. An isotope of xenon has an atomic number of 54 and contains 77 neutrons. What is the mass of this isotope? 8. What is the mass number of uranium-234? 9. How many neutrons are in uranium 234? 10. Silicon is very important to the semiconductor industry. The three naturally occurring isotopes of sil ...
atomic number.
... 4. atoms combine in certain whole-number ratios YES! Called the Law of Definite Proportions 5. In a chemical reaction, atoms are merely rearranged to form new compounds; they are not created, destroyed, or changed into atoms of any other elements. Yes, except for nuclear reactions that can change at ...
... 4. atoms combine in certain whole-number ratios YES! Called the Law of Definite Proportions 5. In a chemical reaction, atoms are merely rearranged to form new compounds; they are not created, destroyed, or changed into atoms of any other elements. Yes, except for nuclear reactions that can change at ...
Slide 1
... to different compounds made from the same elements. -The mass ratio for one of the elements that combines with a fixed mass of the other element can be expressed in small whole #’s Examples: H2O : 2 H + 1 O (2:1) H2O2 : 2 H + 2 O (2:2) ...
... to different compounds made from the same elements. -The mass ratio for one of the elements that combines with a fixed mass of the other element can be expressed in small whole #’s Examples: H2O : 2 H + 1 O (2:1) H2O2 : 2 H + 2 O (2:2) ...
Mixtures, Pure Substance and Isotopes
... • Unstable Isotopes: known as radioisotopes and are subject to radioactive decay. – This ‘decay’ means that over time, these isotopes turn into another isotope of the same element ...
... • Unstable Isotopes: known as radioisotopes and are subject to radioactive decay. – This ‘decay’ means that over time, these isotopes turn into another isotope of the same element ...
Midterm Review Packet - Mrs. McKenzie`s Chemistry and ICP Classes
... Does this number ever change for atoms of the same element? 2. The atomic mass number of an element is ___________________________? If this number changes for an atom of a specific element you have an (ion, isotope) ___________________? Has the number of protons or neutrons changed? 3. When an eleme ...
... Does this number ever change for atoms of the same element? 2. The atomic mass number of an element is ___________________________? If this number changes for an atom of a specific element you have an (ion, isotope) ___________________? Has the number of protons or neutrons changed? 3. When an eleme ...
PS 2.3
... For example, all elements in period 4 have four occupied energy levels. This is an introduction to quantum theory that will be studied in chemistry. Recognize a given element’s atomic mass (the weighted average of the masses of the naturally occurring isotopes of the element), by recognizing tha ...
... For example, all elements in period 4 have four occupied energy levels. This is an introduction to quantum theory that will be studied in chemistry. Recognize a given element’s atomic mass (the weighted average of the masses of the naturally occurring isotopes of the element), by recognizing tha ...
Atomic terms - ATOMIC NUMBER: The number of protons in the
... 35.45 amu (Natural chlorine is mostly chlorine-35) ...
... 35.45 amu (Natural chlorine is mostly chlorine-35) ...
Adv review key
... J) Draw the electron dot diagram (Lewis Dot Structure) and then tell if it would give up or take on electrons to get a full shell. Also tell what charge it would have (positive or negative and how much ex: +2) ...
... J) Draw the electron dot diagram (Lewis Dot Structure) and then tell if it would give up or take on electrons to get a full shell. Also tell what charge it would have (positive or negative and how much ex: +2) ...
APS 1st semester exam review 2016
... J) Draw the electron dot diagram (Lewis Dot Structure) and then tell if it would give up or take on electrons to get a full shell. Also tell what charge it would have (positive or negative and how much ex: +2) ...
... J) Draw the electron dot diagram (Lewis Dot Structure) and then tell if it would give up or take on electrons to get a full shell. Also tell what charge it would have (positive or negative and how much ex: +2) ...
Honors Chemistry
... length / meter mass / kilogram time / second volume density chemical property physical property malleability ductility conductivity reactivity phase state solid liquid gas melting / freezing evaporating / condensing mixture solution substance homogeneous heterogeneous element compound atom molecule ...
... length / meter mass / kilogram time / second volume density chemical property physical property malleability ductility conductivity reactivity phase state solid liquid gas melting / freezing evaporating / condensing mixture solution substance homogeneous heterogeneous element compound atom molecule ...
Chem 115 POGIL Worksheet
... Metals occupy the left and center of the periodic table. Non-metals occupy the upper right corner of the periodic table. Metalloids fall along the border between the metals and nonmetals. 22. Are the majority of elements metals, nonmetals, or metalloids? The majority of elements are metals, followed ...
... Metals occupy the left and center of the periodic table. Non-metals occupy the upper right corner of the periodic table. Metalloids fall along the border between the metals and nonmetals. 22. Are the majority of elements metals, nonmetals, or metalloids? The majority of elements are metals, followed ...
AP Semester I Review: Free Response Questions
... a. The elements contained in acetylsalicylic acid are hydrogen, carbon, and oxygen. The combustion of 3.000g of the pure compound yields 1.200 g of water and 3.72 L of dry carbon dioxide, measured at 750. mmHg and 25oC. Calculate the mass, in g, of each element in the 3.000g sample. ...
... a. The elements contained in acetylsalicylic acid are hydrogen, carbon, and oxygen. The combustion of 3.000g of the pure compound yields 1.200 g of water and 3.72 L of dry carbon dioxide, measured at 750. mmHg and 25oC. Calculate the mass, in g, of each element in the 3.000g sample. ...
Any substance that cannot be decomposed into
... carbon isotope of mass 12, which is written carbon-12. This is the isotope of carbon that has in its nucleus 6 neutrons in addition to the 6 protons that all carbon atoms possess. One twelfth of the weight of carbon-12 is defined as the relative atomic weight unit (awu). Sometimes it is also called ...
... carbon isotope of mass 12, which is written carbon-12. This is the isotope of carbon that has in its nucleus 6 neutrons in addition to the 6 protons that all carbon atoms possess. One twelfth of the weight of carbon-12 is defined as the relative atomic weight unit (awu). Sometimes it is also called ...
Name - Quia
... Explain the relationship between nucleon number and stability of nuclei. Explain why nuclear reactions occur and know how to balance a nuclear equation. Define and relate the terms radioactive decay and nuclear radiation. Describe the different types of radioactive decay and their effects on the nuc ...
... Explain the relationship between nucleon number and stability of nuclei. Explain why nuclear reactions occur and know how to balance a nuclear equation. Define and relate the terms radioactive decay and nuclear radiation. Describe the different types of radioactive decay and their effects on the nuc ...
elements in a family have the same number of
... Noble Gases are colorless gases that are extremely unreactive. One important property of the noble gases is their inactivity. They are inactive because their outermost energy level is full. Because they do not readily combine with other elements to form compounds, the noble gases are called inert. T ...
... Noble Gases are colorless gases that are extremely unreactive. One important property of the noble gases is their inactivity. They are inactive because their outermost energy level is full. Because they do not readily combine with other elements to form compounds, the noble gases are called inert. T ...
Notes on Atomic Structure atoms
... Atoms of one element can combine with atoms of other elements to form compounds. A given compound always has the same relative numbers and types of atoms. Atoms are indivisible in chemical processes. That is, atoms are not created or destroyed in chemical reactions. A chemical reaction simply ch ...
... Atoms of one element can combine with atoms of other elements to form compounds. A given compound always has the same relative numbers and types of atoms. Atoms are indivisible in chemical processes. That is, atoms are not created or destroyed in chemical reactions. A chemical reaction simply ch ...
Document
... Dalton’s Atomic Theory - Summary 1. matter is composed, indivisible particles (atoms) 2. all atoms of a particular element are identical 3. different elements have different atoms 4. atoms combine in certain whole-number ratios 5. In a chemical reaction, atoms are merely rearranged to form new comp ...
... Dalton’s Atomic Theory - Summary 1. matter is composed, indivisible particles (atoms) 2. all atoms of a particular element are identical 3. different elements have different atoms 4. atoms combine in certain whole-number ratios 5. In a chemical reaction, atoms are merely rearranged to form new comp ...
Neptunium
![](https://commons.wikimedia.org/wiki/Special:FilePath/Phase_diagram_of_neptunium_(1975).png?width=300)
Neptunium is a chemical element with symbol Np and atomic number 93. A radioactive actinide metal, neptunium is the first transuranic element. Its position in the periodic table just after uranium, named after the planet Uranus, led to it being named after Neptune, the next planet beyond Uranus. A neptunium atom has 93 protons and 93 electrons, of which seven are valence electrons. Neptunium metal is silvery and tarnishes when exposed to air. The element occurs in three allotropic forms and it normally exhibits five oxidation states, ranging from +3 to +7. It is radioactive, pyrophoric, and can accumulate in bones, which makes the handling of neptunium dangerous.Although many false claims of its discovery were made over the years, the element was first synthesized by Edwin McMillan and Philip H. Abelson at the Berkeley Radiation Laboratory in 1940. Since then, most neptunium has been and still is produced by neutron irradiation of uranium in nuclear reactors. The vast majority is generated as a by-product in conventional nuclear power reactors. While neptunium itself has no commercial uses at present, it is widely used as a precursor for the formation of plutonium-238, used in radioisotope thermal generators. Neptunium has also been used in detectors of high-energy neutrons.The most stable isotope of neptunium, neptunium-237, is a by-product of nuclear reactors and plutonium production. It, and the isotope neptunium-239, are also found in trace amounts in uranium ores due to neutron capture reactions and beta decay.