Notes - Zion Central Middle School
... Isotopes are atoms of the same elements that have different numbers of neutrons. o Each isotope of an element has a different mass number. ...
... Isotopes are atoms of the same elements that have different numbers of neutrons. o Each isotope of an element has a different mass number. ...
2 - grade11chemistry
... unless arrangements have been made with your teacher prior to the evaluation. • Do NOT expect to show up the next day with a note of any kind and be able to write the test/quiz. • Projects/assignments are due on the given due dates. If there are difficulties, discuss these issues with your teacher a ...
... unless arrangements have been made with your teacher prior to the evaluation. • Do NOT expect to show up the next day with a note of any kind and be able to write the test/quiz. • Projects/assignments are due on the given due dates. If there are difficulties, discuss these issues with your teacher a ...
Answers to Review Questions for Atomic Theory
... destroyed. We now know that there are sub-atomic particles: protons, neutrons and electrons, and these can be separated or joined during nuclear reactions 16. Three experiments or pieces of scientific equipment were key to our present understanding of atomic structure. For each of the following, out ...
... destroyed. We now know that there are sub-atomic particles: protons, neutrons and electrons, and these can be separated or joined during nuclear reactions 16. Three experiments or pieces of scientific equipment were key to our present understanding of atomic structure. For each of the following, out ...
TEST on Atomic Structure
... _____ 55) How do the isotopes Carbon-12 and Carbon-13 differ? a. Carbon-12 has one more electron than hydrogen-1. b. Carbon-12 has 12 neutrons; carbon-13 has 13 neutrons c. Carbon-13 has one more neutron than carbon-12 d. Carbon-13 has one more proton that carbon-12 _____ 56) The atomic mass of an ...
... _____ 55) How do the isotopes Carbon-12 and Carbon-13 differ? a. Carbon-12 has one more electron than hydrogen-1. b. Carbon-12 has 12 neutrons; carbon-13 has 13 neutrons c. Carbon-13 has one more neutron than carbon-12 d. Carbon-13 has one more proton that carbon-12 _____ 56) The atomic mass of an ...
Unit 3-The Atom Chapter Packet
... _____________________________1. electrical charges that are not in motion. _____________________________2. stream of particles originating from a cathode _____________________________3. proposed the first atomic model that accounted for the electrical nature of the atom _____________________________ ...
... _____________________________1. electrical charges that are not in motion. _____________________________2. stream of particles originating from a cathode _____________________________3. proposed the first atomic model that accounted for the electrical nature of the atom _____________________________ ...
Chapter 1 - Atomic Structure
... We have already learned that atoms are composed of three particles: protons, neutrons and electrons. The central nucleus of the atom contains the neutrons and positively charged protons. The nucleus is surrounded by as many orbital electrons (each with a charge of –1) as there are protons (each with ...
... We have already learned that atoms are composed of three particles: protons, neutrons and electrons. The central nucleus of the atom contains the neutrons and positively charged protons. The nucleus is surrounded by as many orbital electrons (each with a charge of –1) as there are protons (each with ...
Name Parts of an Atom Worksheet Date_______ Substances that
... Substances that contain only one kind of atom are called elements. Some familiar elements are oxygen, gold, silver, and helium. An atom is the smallest part of an element that can be broken down and still have the characteristics of that element. All atoms are basically the same. All atoms of the sa ...
... Substances that contain only one kind of atom are called elements. Some familiar elements are oxygen, gold, silver, and helium. An atom is the smallest part of an element that can be broken down and still have the characteristics of that element. All atoms are basically the same. All atoms of the sa ...
Masses of Atoms
... Isotope ~ atoms of the same element, with different numbers of neutrons Carbon - 12 (6 protons, 6 neutrons) Carbon - 14 (6 protons, 8 neutrons) ...
... Isotope ~ atoms of the same element, with different numbers of neutrons Carbon - 12 (6 protons, 6 neutrons) Carbon - 14 (6 protons, 8 neutrons) ...
Atomic Structure Test – Study Guide
... What is the electrical charge and position in the atom for each of the subatomic particles? 1. Electron - negative charge; located in a “cloud” rotating around the nucleus 2. Proton – positive charge; located in the center or nucleus of the atom 3. Neutron - no charge; located in the center or nucle ...
... What is the electrical charge and position in the atom for each of the subatomic particles? 1. Electron - negative charge; located in a “cloud” rotating around the nucleus 2. Proton – positive charge; located in the center or nucleus of the atom 3. Neutron - no charge; located in the center or nucle ...
Elements, Compounds and Mixtures
... chemical compound that can take place in a chemical reaction. • Has the same chemical properties of that element or compound. • Some molecules consist of two atoms of the same element. • Ex. O2 • Other molecules consists of two or more atoms. • Ex. (H2O) ...
... chemical compound that can take place in a chemical reaction. • Has the same chemical properties of that element or compound. • Some molecules consist of two atoms of the same element. • Ex. O2 • Other molecules consists of two or more atoms. • Ex. (H2O) ...
Parts Of An Atom
... Substances that contain only one kind of atom are called elements. Some familiar elements are oxygen, gold, silver, and helium. An atom is the smallest part of an element that can be broken down and still have the characteristics of that element. All atoms are basically the same. All atoms of the sa ...
... Substances that contain only one kind of atom are called elements. Some familiar elements are oxygen, gold, silver, and helium. An atom is the smallest part of an element that can be broken down and still have the characteristics of that element. All atoms are basically the same. All atoms of the sa ...
Structure of Atoms
... 99% of carbon atoms have 6 neutrons (12C). Most of the remaining 1% of carbon atoms have 7 neutrons (13C) while the rarest carbon isotope, with 8 neutrons, is 14C. Both 12C and 13C are stable isotopes while 14C is radioactive When 14C decays, one of its neutrons is converted to a proton and an ...
... 99% of carbon atoms have 6 neutrons (12C). Most of the remaining 1% of carbon atoms have 7 neutrons (13C) while the rarest carbon isotope, with 8 neutrons, is 14C. Both 12C and 13C are stable isotopes while 14C is radioactive When 14C decays, one of its neutrons is converted to a proton and an ...
What are Valence Electrons
... that makes each atom more sta______. ble • Number of valence electrons increase to 8 (or 2 for hydrogen) • Chemical bond is the force of attraction that holds two atoms together as a result of rearr___________ angement of electrons between them. ...
... that makes each atom more sta______. ble • Number of valence electrons increase to 8 (or 2 for hydrogen) • Chemical bond is the force of attraction that holds two atoms together as a result of rearr___________ angement of electrons between them. ...
Ordering the elements in the Periodic Table
... Hence atomic number became more meaningful and the three pairs of elements that seemed to be in the wrong order could be explained. Moseley used what was then brand-new technology in his experiments. A device now called an electron gun had just been developed. He used this to fire a stream of electr ...
... Hence atomic number became more meaningful and the three pairs of elements that seemed to be in the wrong order could be explained. Moseley used what was then brand-new technology in his experiments. A device now called an electron gun had just been developed. He used this to fire a stream of electr ...
IT IS ELEMENTARY - the OLLI at UCI Blog
... plant or animal origin—Sulfur was the exception • 1914-1918 A “golden age” for the military use of chemicals—the first weapons of mass destruction • Since the 1930s Chemical weapons have been used against defenseless peoples in colonial or civil wars ...
... plant or animal origin—Sulfur was the exception • 1914-1918 A “golden age” for the military use of chemicals—the first weapons of mass destruction • Since the 1930s Chemical weapons have been used against defenseless peoples in colonial or civil wars ...
Atoms & Elements2013
... An atom is the smallest particle of an element that retains its identity in a chemical reaction. Word origin: atom comes from the Greek word atomos meaning “ indivisible” ...
... An atom is the smallest particle of an element that retains its identity in a chemical reaction. Word origin: atom comes from the Greek word atomos meaning “ indivisible” ...
Practice Test Chapters 17 & 18
... become smaller in size because • Their mass becomes more concentrated • More mass means more protons, which act to pull electrons closer • More massive atoms have greater numbers of shells • They don’t ...
... become smaller in size because • Their mass becomes more concentrated • More mass means more protons, which act to pull electrons closer • More massive atoms have greater numbers of shells • They don’t ...
Chem102_ch03_atoms_and_the_periodic_table
... Electrons in the highest occupied energy level are the greatest stable distance from the nucleus. These outermost electrons are known as valence electrons. Shell is a principal energy level defined by a given value of n, where n can be 1,2,3,4 etc… and is capable of holding 2n2 electrons. An orbital ...
... Electrons in the highest occupied energy level are the greatest stable distance from the nucleus. These outermost electrons are known as valence electrons. Shell is a principal energy level defined by a given value of n, where n can be 1,2,3,4 etc… and is capable of holding 2n2 electrons. An orbital ...
Atomic Structure Paper Plate Model Plate 1: Front
... Back- Write a brief explanation about how you formed your ion. Did your element need to gain or lose electrons? How many? Why? What is the overall charge on your Ion? (+1, +2, or -1) Plate 3: Front- Draw an Isotope that represents your element. Label the features that make this an isotope compared t ...
... Back- Write a brief explanation about how you formed your ion. Did your element need to gain or lose electrons? How many? Why? What is the overall charge on your Ion? (+1, +2, or -1) Plate 3: Front- Draw an Isotope that represents your element. Label the features that make this an isotope compared t ...
`atoms`. - MrsCoxsChemistryCorner
... • Many people respected his ideas, therefore the atomic theory that was proposed 100 years earlier was rejected for the next 2000 years. ...
... • Many people respected his ideas, therefore the atomic theory that was proposed 100 years earlier was rejected for the next 2000 years. ...
Document
... The shells are numbered according to their distance from the nucleus. The shell closest to the nucleus is assigned number 1, the next furthest, number 2 etc. Each shell can hold a certain maximum number of electrons. The maximum number of electrons that an energy shell can hold is given by the formu ...
... The shells are numbered according to their distance from the nucleus. The shell closest to the nucleus is assigned number 1, the next furthest, number 2 etc. Each shell can hold a certain maximum number of electrons. The maximum number of electrons that an energy shell can hold is given by the formu ...
Study Guide Answer Key
... 2. Consider an element Z that has two naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 19.0 is 55.0% abundant; the isotope with a mass number of 21.0 is 45.0% abundant. What is the average atomic mass for element Z? [(mass A) (%A)] + [(mass B) (%B ...
... 2. Consider an element Z that has two naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 19.0 is 55.0% abundant; the isotope with a mass number of 21.0 is 45.0% abundant. What is the average atomic mass for element Z? [(mass A) (%A)] + [(mass B) (%B ...
Neptunium
.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.