Element
... •consists of atoms of two or more different elements bound together •can be broken down into a simpler type of matter (elements) by chemical means (but not by physical means) •has properties that are different from its component elements •always contains the same ratio of its component atoms. ...
... •consists of atoms of two or more different elements bound together •can be broken down into a simpler type of matter (elements) by chemical means (but not by physical means) •has properties that are different from its component elements •always contains the same ratio of its component atoms. ...
Chapter 4 PowerPoint
... atoms of any one element differ from those of any other element. Atoms of different elements can physically mix together or can chemically combine in simple whole-number ratios to form compounds. Chemical reactions occur when atoms are separated, joined, or rearranged. Atoms of one element, however, ...
... atoms of any one element differ from those of any other element. Atoms of different elements can physically mix together or can chemically combine in simple whole-number ratios to form compounds. Chemical reactions occur when atoms are separated, joined, or rearranged. Atoms of one element, however, ...
Chapter 4 Chemical Foundations: Elements, Atoms, and Ions
... comprised of 8.9 grams oxygen and 1.1 grams hydrogen. Thus, a 100.0 gram sample of water, is comprised of 89.0 grams of oxygen and 11.0 grams of hydrogen. ...
... comprised of 8.9 grams oxygen and 1.1 grams hydrogen. Thus, a 100.0 gram sample of water, is comprised of 89.0 grams of oxygen and 11.0 grams of hydrogen. ...
Atoms, the Periodic Table and Moles - Ars
... Periodic Law The Periodic Law states that the properties of the elements when arranged in order of increasing atomic number show a periodicity of properties. What this means is that all of the elements in a given column have similar chemical properties. The Periodic Table is a way of showing which e ...
... Periodic Law The Periodic Law states that the properties of the elements when arranged in order of increasing atomic number show a periodicity of properties. What this means is that all of the elements in a given column have similar chemical properties. The Periodic Table is a way of showing which e ...
Radioactivity
... andher husband Pierre. The Curies extracted uranium from ore and to their surprise, found that the leftover ore showed more activity than the pure uranium. They concluded that the ore contained other radioactive elements. This led to the discoveries of the elements polonium and radium. Ernest Ruther ...
... andher husband Pierre. The Curies extracted uranium from ore and to their surprise, found that the leftover ore showed more activity than the pure uranium. They concluded that the ore contained other radioactive elements. This led to the discoveries of the elements polonium and radium. Ernest Ruther ...
The Atom
... mass #’s (or simply, • Because of this, they have different _________ masses different ___________.) • Isotopes are the same element, but the atoms weigh a different neutrons amount because of the # of ______________. Examples---> (1) Carbon-12 & Carbon-13 (2) Chlorine-35 & Chlorine-37 (The # shown ...
... mass #’s (or simply, • Because of this, they have different _________ masses different ___________.) • Isotopes are the same element, but the atoms weigh a different neutrons amount because of the # of ______________. Examples---> (1) Carbon-12 & Carbon-13 (2) Chlorine-35 & Chlorine-37 (The # shown ...
Atoms - Learn More Chemistry
... • an atom’s identity comes from the number of protons in its nucleus • the number of protons is called the atomic number • every element has a unique atomic number • the atomic number is written above the chemical symbol on the periodic table • since atoms are electrically neutral, the number of pos ...
... • an atom’s identity comes from the number of protons in its nucleus • the number of protons is called the atomic number • every element has a unique atomic number • the atomic number is written above the chemical symbol on the periodic table • since atoms are electrically neutral, the number of pos ...
CS 211 – Spring 2017 Lab 4: Molar Mass
... - C4 is the Atomic Weight of the element specified in A4. When A4 is blank (“ “), leave C4 empty(“”). Note that A4 will never be empty (“”), but will be a single blank (“ “). - D4 is the total Atomic Weight for the element multiplied by the number of atoms entered by the user in B4. There are three ...
... - C4 is the Atomic Weight of the element specified in A4. When A4 is blank (“ “), leave C4 empty(“”). Note that A4 will never be empty (“”), but will be a single blank (“ “). - D4 is the total Atomic Weight for the element multiplied by the number of atoms entered by the user in B4. There are three ...
Notes: Structure of matter
... What comprises most of an atom's mass? What comprises most of the atom's volume? List the 3 parts to an atom and their ...
... What comprises most of an atom's mass? What comprises most of the atom's volume? List the 3 parts to an atom and their ...
UNIT 2 – THE ATOM - Neshaminy School District
... Write the symbol of the element. If the atom has a charge, it must be written with a positive or a negative and the number of the charge as a superscript behind the symbol. If there is no charge on the atom, then just write the symbol. ...
... Write the symbol of the element. If the atom has a charge, it must be written with a positive or a negative and the number of the charge as a superscript behind the symbol. If there is no charge on the atom, then just write the symbol. ...
Chapter 3 - SchoolRack
... Most of the particles passed right through A few particles were deflected VERY FEW were greatly deflected ...
... Most of the particles passed right through A few particles were deflected VERY FEW were greatly deflected ...
Document
... Most of the particles passed right through A few particles were deflected VERY FEW were greatly deflected ...
... Most of the particles passed right through A few particles were deflected VERY FEW were greatly deflected ...
File
... matter composed of small particles that can not be divided. ( no longer valid). 2. All atoms of a given element are chemically identical to each other. (no longer valid). 3. Atoms of different elements can be combined, separated, or rearranged into simple whole number ratios (still valid). Are they ...
... matter composed of small particles that can not be divided. ( no longer valid). 2. All atoms of a given element are chemically identical to each other. (no longer valid). 3. Atoms of different elements can be combined, separated, or rearranged into simple whole number ratios (still valid). Are they ...
4.1 Early Theories of Matter The Philosophers Democritus – Greek
... Accidentally discovered radioactivity while working with uranium salts Radioactivity – the phenomenon of rays or particles being produced spontaneously by unstable atomic nuclei (also referred to as radiation) Radioactivity can accompany changes in the identities of elements Transmutation – ...
... Accidentally discovered radioactivity while working with uranium salts Radioactivity – the phenomenon of rays or particles being produced spontaneously by unstable atomic nuclei (also referred to as radiation) Radioactivity can accompany changes in the identities of elements Transmutation – ...
Atoms, Isotopes and Relative Atomic Masses
... State two similarities between the atomic structures of 79Br and 81Br. ...
... State two similarities between the atomic structures of 79Br and 81Br. ...
Matter
... Isotopes are atoms of the same element with equal number of protons but different number of neutrons. OR Isotopes are atoms of the same element with equal atomic number but different mass number. Isotopes have similar chemical properties because they have the same number of outermost shell electrons ...
... Isotopes are atoms of the same element with equal number of protons but different number of neutrons. OR Isotopes are atoms of the same element with equal atomic number but different mass number. Isotopes have similar chemical properties because they have the same number of outermost shell electrons ...
Chapter 2
... Atomic and molecular masses can be measured with great accuracy with a mass spectrometer. Average Mass • Because in the real world we use large amounts of atoms and molecules, we use average masses in calculations. • Average mass is calculated from the isotopes of an element weighted by their relati ...
... Atomic and molecular masses can be measured with great accuracy with a mass spectrometer. Average Mass • Because in the real world we use large amounts of atoms and molecules, we use average masses in calculations. • Average mass is calculated from the isotopes of an element weighted by their relati ...
Atomic theory intro
... 2.1.3 Define the terms mass number (A), atomic number (Z) and isotopes of an element 2.1.4 Deduce the symbol for an isotope given its mass number and atomic number 2.1.5 Calculate the number of protons, neutrons and electrons in atoms and ions from the mass number, atomic number and charge. 2.1.6 Co ...
... 2.1.3 Define the terms mass number (A), atomic number (Z) and isotopes of an element 2.1.4 Deduce the symbol for an isotope given its mass number and atomic number 2.1.5 Calculate the number of protons, neutrons and electrons in atoms and ions from the mass number, atomic number and charge. 2.1.6 Co ...
Reading Comprehension - Easy Peasy All-in
... The list of elements is arranged on a scientific chart. The chart is called the periodic table. Each element is grouped with other similar elements. Elements can be metals, nonmetals, or semimetals. Semimetals have some of the characteristics of metals, and some of the characteristics of nonmetals. M ...
... The list of elements is arranged on a scientific chart. The chart is called the periodic table. Each element is grouped with other similar elements. Elements can be metals, nonmetals, or semimetals. Semimetals have some of the characteristics of metals, and some of the characteristics of nonmetals. M ...
Chapter 4 Atomic Structure
... compound, the masses of one element combined with a fixed mass of the second are in the ratio of small whole numbers. Same elements to combine in different ratios to give different substances. ...
... compound, the masses of one element combined with a fixed mass of the second are in the ratio of small whole numbers. Same elements to combine in different ratios to give different substances. ...
Atomic Information
... • If electrons are added to the atom, then there are more negative charges than positive charges. The atom becomes negatively charged and is called an anion. • If electrons are removed from the atom, then there are less negative charges than positive charges. The atom becomes positively charged and ...
... • If electrons are added to the atom, then there are more negative charges than positive charges. The atom becomes negatively charged and is called an anion. • If electrons are removed from the atom, then there are less negative charges than positive charges. The atom becomes positively charged and ...
Promethium
Promethium, originally prometheum, is a chemical element with symbol Pm and atomic number 61. All of its isotopes are radioactive; it is one of only two such elements that are followed in the periodic table by elements with stable forms, a distinction shared with technetium. Chemically, promethium is a lanthanide, which forms salts when combined with other elements. Promethium shows only one stable oxidation state of +3; however, a few +2 compounds may exist.In 1902, Bohuslav Brauner suggested there was an element with properties intermediate between those of the known elements neodymium (60) and samarium (62); this was confirmed in 1914 by Henry Moseley who, having measured the atomic numbers of all the elements then known, found there was an element with atomic number 61. In 1926, an Italian and an American group claimed to have isolated a sample of element 61; both ""discoveries"" were soon proven to be false. In 1938, during a nuclear experiment conducted at Ohio State University, a few radioactive nuclides were produced that certainly were not radioisotopes of neodymium or samarium, but there was a lack of chemical proof that element 61 was produced, and the discovery was not generally recognized. Promethium was first produced and characterized at Oak Ridge National Laboratory in 1945 by the separation and analysis of the fission products of uranium fuel irradiated in a graphite reactor. The discoverers proposed the name ""prometheum"" (the spelling was subsequently changed), derived from Prometheus, the Titan in Greek mythology who stole fire from Mount Olympus and brought it down to humans, to symbolize ""both the daring and the possible misuse of mankind's intellect"". However, a sample of the metal was made only in 1963.There are two possible sources for natural promethium: rare decays of natural europium-151 (producing promethium-147), and uranium (various isotopes). Practical applications exist only for chemical compounds of promethium-147, which are used in luminous paint, atomic batteries, and thickness measurement devices, even though promethium-145 is the most stable promethium isotope. Because natural promethium is exceedingly scarce, it is typically synthesized by bombarding uranium-235 (enriched uranium) with thermal neutrons to produce promethium-147.