Atomic mass of elements list
[DOC File]PERIODIC TABLE
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Atomic mass: the mass of an atom (the sum of the protons and neutrons in the atom’s nucleus) Atomic number: the number of protons in an atom’s nucleus. Compound: a substance that contains two or more elements that are chemically combined and cannot be separated by physical means
[DOC File]Name
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PERIODIC TABLE. Development of the Periodic Table (pp. 348 - 352) 1. In the late 1790s Lavoisier compiled a list of 23 known elements. 2. During the 1800s many more were discovered as scientists used electricity to separate compounds and newly developed instruments, such as the spectrometer, to identify the elements.
[DOC File]Chemistry Chapter 5 Exam
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Oct 03, 2014 · If the atomic mass is the sum of protons and neutrons in an atom, why are the atomic masses on the periodic table not all whole numbers? Because the atoms of elements come in a variety of isotopes, meaning they are made up of atoms with the same number of protons (atomic number) but different number of neutrons in the nucleus.
[DOC File]A Look at the Past:
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a. atomic masses of the elements. b. atomic numbers of the elements. c. sublevels being filled with electrons. d. number of isotopes of the elements in the period. ____ 42. Because the first energy level contains only the 1s sublevel, the number of elements in this period is. a. 1. c. 4. b. 2. d. 8. ____ 43. In Period 3 there are 8 elements.
Honors Chemistry Worksheet – Atomic Structure
The modern Periodic Table of the Elements still uses rows and columns. The columns, still called families, consist of elements with similar properties. The rows, still called periods, list the elements by atomic number, increasing by 1 as you move from left to right. At the present time, the Periodic Table of the Elements lists 112 elements.
List of chemical elements - Wikipedia
of elements, or use a chart in your classroom to answer number 9. 9. Add to the chart by filling out the information for these elements: sodium, aluminum, and potassium. 10. Click the next button and define: atomic number, mass number and atomic mass. Atomic Models and Timeline. Use the powerpoint and websites below to complete the timeline chart.
[DOC File]Physical Science Unit Vocabulary List
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The number of neutrons in an isotope may be determined by subtracting the number of protons (atomic number) from the mass number. #n0 = A - Z. If working with the element, the atomic mass may be rounded to a whole number and used as a mass number. 9. An atomic nucleus contains 6 protons and 6 neutrons. About the nucleus move 2 electrons in the ...
[DOCX File]Topic List 'Atomic Structure'
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To provide a more meaningful understanding of the elements of the periodic table. ... 2) What is the chemical symbol for your element?(1) 3) What is the atomic number?(1) 4) What is the atomic mass?(1) 5) How many electrons does this element have?(1) 6) How many protons does this element have?(1) 7) How many neutrons does this element have?(1 ...
[DOC File]Common Elements and Atomic Structure
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Topic List for Atomic Structure Unit. General Chemistry. main regions of the periodic table. metals. nonmetals. metalloids. specific regions of the table. alkali metals, alkaline earth metals, transition elements, coinage metals, halogens, noble gases, lanthanides, actinides, inner transition elements…
[DOC File]Chemical Elements Project
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The atomic mass of an element is a weighted average of the mass of the isotopes of the element. Atomic mass is measured in atomic mass units (amu), which is based on the mass of a carbon-12 atom. The atomic mass of an element usually is close to the mass of its most abundant isotope. 50 Name Class Date
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