Chapter 3
... d. Atoms of different elements combine in simple _______________________________ to form ______________________________________. e. In chemical reactions, atoms are__________________________________________ _____________________________. Modern Atomic Theory 8. Which aspects of Dalton's theory have ...
... d. Atoms of different elements combine in simple _______________________________ to form ______________________________________. e. In chemical reactions, atoms are__________________________________________ _____________________________. Modern Atomic Theory 8. Which aspects of Dalton's theory have ...
Chapter Review - BAschools.org
... 29. CALCULATE One of the more common isotopes of mercury is mercury-200. How many protons and neutrons are in the nucleus of mercury-200? 30. INFER Cadmium occupies the square directly above mercury on the periodic table. Is a cadium atom larger or smaller than a mercury atom? 31. CALCULATE An isoto ...
... 29. CALCULATE One of the more common isotopes of mercury is mercury-200. How many protons and neutrons are in the nucleus of mercury-200? 30. INFER Cadmium occupies the square directly above mercury on the periodic table. Is a cadium atom larger or smaller than a mercury atom? 31. CALCULATE An isoto ...
Mass Defect (not in book)
... element. In ordinary chemical reactions, atoms are rearranged; they are not changed into other elements. In nuclear reaction atoms can and do change from one element to another. Obviously, this change requires a change in the nucleus of the atoms involved. This chapter focuses on the changes that th ...
... element. In ordinary chemical reactions, atoms are rearranged; they are not changed into other elements. In nuclear reaction atoms can and do change from one element to another. Obviously, this change requires a change in the nucleus of the atoms involved. This chapter focuses on the changes that th ...
Unit 2 Atomic structure review
... 8. What are atoms that have different numbers of protons? 9. How many protons, neutron, and electrons does U-234 have? 10. How many electrons would it take to equal the mass of one proton or one neutron? 11. What element has 21 protons and 24 neutrons? 12. An atom of potassium has 19 protons and 20 ...
... 8. What are atoms that have different numbers of protons? 9. How many protons, neutron, and electrons does U-234 have? 10. How many electrons would it take to equal the mass of one proton or one neutron? 11. What element has 21 protons and 24 neutrons? 12. An atom of potassium has 19 protons and 20 ...
CHAPTER 3 sec 1 - Leon County Schools
... one element are different from another element. 3. Atoms of different elements can physically mix together (chemically combine) in whole-number ratios to form compounds. ...
... one element are different from another element. 3. Atoms of different elements can physically mix together (chemically combine) in whole-number ratios to form compounds. ...
SNC 1D chem chpt2
... of protons but a different number of neutrons. Since each isotope has a unique mass number, you can specify an isotope of an element by placing its mass number after the name of the element. EG. Hygrogen-1 and hydrogen-2 ...
... of protons but a different number of neutrons. Since each isotope has a unique mass number, you can specify an isotope of an element by placing its mass number after the name of the element. EG. Hygrogen-1 and hydrogen-2 ...
Name: Date: ______ Period: Unit 3 – Atomic Structure Review
... 6. What do we call atoms that have gained or lost electrons? Ions 7. What do we call atoms of the same element that have different numbers of neutrons? Isotope 8. What are atoms that have different numbers of protons? Different element (proton determines the IDENTIY of element) 9. How many protons, ...
... 6. What do we call atoms that have gained or lost electrons? Ions 7. What do we call atoms of the same element that have different numbers of neutrons? Isotope 8. What are atoms that have different numbers of protons? Different element (proton determines the IDENTIY of element) 9. How many protons, ...
atomic numbers
... over time to become more stable. ► Half-Life: the amount of time that it takes half of a radioisotope sample to decay. ...
... over time to become more stable. ► Half-Life: the amount of time that it takes half of a radioisotope sample to decay. ...
Periodic Table ppt
... atom is also the Atomic number, so therefore the Atomic number also represents the amount of Protons in the nucleus of that Atom. ...
... atom is also the Atomic number, so therefore the Atomic number also represents the amount of Protons in the nucleus of that Atom. ...
19. Define the law of multiple proportions. Elements form
... 19. Define the law of multiple proportions. Elements form compounds in simple whole number ratios 20. What do isotopes of the same element have in common and what is different? Isotopes have the same number of protons, electrons and atomic number Isotopes have a different mass number and number of n ...
... 19. Define the law of multiple proportions. Elements form compounds in simple whole number ratios 20. What do isotopes of the same element have in common and what is different? Isotopes have the same number of protons, electrons and atomic number Isotopes have a different mass number and number of n ...
Atoms and Atomic Theory
... This does not mean that there are 17 protons, 17 electrons and 18.5 neutrons in an atom of chlorine. It is not possible to have a fraction of a neutron, there can only be a whole number of neutrons in an atom. So what does it mean, and where does the 0.5 come from? Here is the explanation. The non i ...
... This does not mean that there are 17 protons, 17 electrons and 18.5 neutrons in an atom of chlorine. It is not possible to have a fraction of a neutron, there can only be a whole number of neutrons in an atom. So what does it mean, and where does the 0.5 come from? Here is the explanation. The non i ...
Chemistry Test Review - Greenslime Home Page
... 3. Describe the most reactive and least reactive families of the periodic table. a. Most reactive – Hydrogen family – have 1 valence electron – all act like metals – highly reactive b. Least reactive – Helium Family (Noble Gases) – have a full valence shell – non-reactive (do not want to bond to any ...
... 3. Describe the most reactive and least reactive families of the periodic table. a. Most reactive – Hydrogen family – have 1 valence electron – all act like metals – highly reactive b. Least reactive – Helium Family (Noble Gases) – have a full valence shell – non-reactive (do not want to bond to any ...
Document
... • How is an elements atomic number like a person’s fingerprint? • Homework: Calculate the p, n and electrons in the following: tantalum, samarium, uranium ...
... • How is an elements atomic number like a person’s fingerprint? • Homework: Calculate the p, n and electrons in the following: tantalum, samarium, uranium ...
Part A: Multiple Choice. Circle the letter
... 7. In general, which of the following properties does NOT increase across a row from left to right? a) atomic number b) atomic radius c) nuclear charge d) ionization energy e) electron affinity 8. Which of the following properties decreases from top to bottom in a column? a) ionization energy b) ato ...
... 7. In general, which of the following properties does NOT increase across a row from left to right? a) atomic number b) atomic radius c) nuclear charge d) ionization energy e) electron affinity 8. Which of the following properties decreases from top to bottom in a column? a) ionization energy b) ato ...
Chapter 10 Power Point - Biloxi Public Schools
... Isotopes - atoms of the same element with different numbers of neutrons (same # of protons); less common than the main element. The existence of isotopes accounts for the average atomic mass. Average atomic mass - the average mass of the mixture of an element & its isotopes; only a whole number if r ...
... Isotopes - atoms of the same element with different numbers of neutrons (same # of protons); less common than the main element. The existence of isotopes accounts for the average atomic mass. Average atomic mass - the average mass of the mixture of an element & its isotopes; only a whole number if r ...
Review Notes for Atomic Structure and Radioactivity Test on Friday
... To find element X, look on the periodic table for the element with this atomic mass = Cl. Radioactivity: 18. Radioactivity is particle or energy emission due to nuclear disintegration. You will find the symbol, charge and mass for the different particles on Reference Table O. Radioactive decay is sp ...
... To find element X, look on the periodic table for the element with this atomic mass = Cl. Radioactivity: 18. Radioactivity is particle or energy emission due to nuclear disintegration. You will find the symbol, charge and mass for the different particles on Reference Table O. Radioactive decay is sp ...
Nuclear Reactions
... nucleus has too many protons and neutrons Beta Emission- results from conversion of neutron to proton and occurs if nucleus has too many neutrons Positron Emission- results from conversion of proton to neutron and occurs if nucleus has too few neutrons Gamma Emission- often accompanies other decay p ...
... nucleus has too many protons and neutrons Beta Emission- results from conversion of neutron to proton and occurs if nucleus has too many neutrons Positron Emission- results from conversion of proton to neutron and occurs if nucleus has too few neutrons Gamma Emission- often accompanies other decay p ...
Pre-AP Chemistry
... Students know how to relate the position of an element in the periodic table to its atomic number and atomic mass. (1a) Students know the nucleus of the atom is much smaller than the atom yet contains most of its mass. (1e) Students know some naturally occurring isotopes of elements are radioa ...
... Students know how to relate the position of an element in the periodic table to its atomic number and atomic mass. (1a) Students know the nucleus of the atom is much smaller than the atom yet contains most of its mass. (1e) Students know some naturally occurring isotopes of elements are radioa ...
Trends in the Periodic Table
... Name: _________________________________ Period: ____ Date: ___ / ___ / ___ ...
... Name: _________________________________ Period: ____ Date: ___ / ___ / ___ ...
Structure of the Atom JJ Thomson- discovered the electron in late
... With the discovery of the neutron, it was also discovered that atoms could contain varied numbers of neutrons. Dalton’s atomic theory has to be modified to reflect this discovery. Dalton’s Atomic Theory – 1808 #2 All atoms of a given element are identical. #2 is modified to: All atoms of a given ele ...
... With the discovery of the neutron, it was also discovered that atoms could contain varied numbers of neutrons. Dalton’s atomic theory has to be modified to reflect this discovery. Dalton’s Atomic Theory – 1808 #2 All atoms of a given element are identical. #2 is modified to: All atoms of a given ele ...
Chapter 5
... - Known as the nuclear model 4.3.) Distinguishing Among Atoms Elements are different because they contain different numbers of protons - Atomic Number: the number of protons in the nucleus of that element o In electrically neutral atoms, the number of protons equals the number of electrons - Mass nu ...
... - Known as the nuclear model 4.3.) Distinguishing Among Atoms Elements are different because they contain different numbers of protons - Atomic Number: the number of protons in the nucleus of that element o In electrically neutral atoms, the number of protons equals the number of electrons - Mass nu ...
Elements - Heartland
... Ernest Rutherford performed an experiment called the “Gold Foil” experiment in 1911. He used an alpha particle (2P + 2N) source and fired them at a piece of very thin gold foil. He expected all of the particles to pass straight through. However, some were deflected and some were even reflected backw ...
... Ernest Rutherford performed an experiment called the “Gold Foil” experiment in 1911. He used an alpha particle (2P + 2N) source and fired them at a piece of very thin gold foil. He expected all of the particles to pass straight through. However, some were deflected and some were even reflected backw ...
Name: Date: ______ Period: Unit 3 – Atomic Structure Review
... 6. What do we call atoms that have gained or lost electrons? Ions 7. What do we call atoms of the same element that have different numbers of neutrons? Isotope 8. What are atoms that have different numbers of protons? Different element (proton determines the IDENTIY of element) 9. How many protons, ...
... 6. What do we call atoms that have gained or lost electrons? Ions 7. What do we call atoms of the same element that have different numbers of neutrons? Isotope 8. What are atoms that have different numbers of protons? Different element (proton determines the IDENTIY of element) 9. How many protons, ...
Phys 282 EXP 8
... 4.28% mass 113. (Using the nuclear masses of 114.9041 and 112.9043 instead of the number of nucleons, 115 and 113, the chemical weight of 114.82 can be calculated.) If the indium is placed where there are many free neutrons with kinetic energies, on the order of 0.03 eV, both isotopes In-115 and In- ...
... 4.28% mass 113. (Using the nuclear masses of 114.9041 and 112.9043 instead of the number of nucleons, 115 and 113, the chemical weight of 114.82 can be calculated.) If the indium is placed where there are many free neutrons with kinetic energies, on the order of 0.03 eV, both isotopes In-115 and In- ...
Neptunium
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.