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Atoms of an element can lose or gain electrons and still
Atoms of an element can lose or gain electrons and still

... 6. In an atom, electrons can be grouped into _________ levels, each holding only a specific number of electrons. (pg. 36, P5) 7. All atoms of the same element have the same number of ________ .(pg. 37, P1) ...
Chapter 5 - Effingham County Schools
Chapter 5 - Effingham County Schools

... nucleus, called the ________ ________. For example, a hydrogen atom has 1 proton so its atomic number is 1. The total number of _______ and _________ in an atom’s nucleus is called its atomic mass number. _______ are atoms of the same element that have a different number of neutrons. Ions are formed ...
Ch. 4: Atoms and the Periodic Table – Study Guide
Ch. 4: Atoms and the Periodic Table – Study Guide

... The first person who suggested that matter was made up of atoms was the Greek philosopher Democritus. The word atom comes from the Greek word that means “unable to be divided.” Dalton’s atomic theory stated that every element was made of atoms that could not be subdivided, atoms of the same element ...
Vocabulary and Section Summary
Vocabulary and Section Summary

The Periodic Table
The Periodic Table

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Atomic Dimensions Practice Sheet. Hydrogen Helium Lithium Boron
Atomic Dimensions Practice Sheet. Hydrogen Helium Lithium Boron

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Name Date Class Period ______

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Keypoints of Basic Atomic Structure
Keypoints of Basic Atomic Structure

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Atoms, Elements, Compounds File

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Chemical reactions revision

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HW-1-Ch1-Atomic-structure-W16

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Study Guide Answer Key

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atomic structure - IGCSE STUDY BANK
atomic structure - IGCSE STUDY BANK

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I can describe an atom and its components I can relate energy levels

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Atomic Structure ppt

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Chapter 3 Atoms and Elements
Chapter 3 Atoms and Elements

... Since atomic mass is equal to the sum of the number of protons and neutrons, how can you have a fractional number? How was an atomic mass value of 35.45 arrived at? Since in a “handful” of Cl there is a mixture of two isotopes in the abundances shown on the left, an average atomic mass has been defi ...
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BellWork 2/16/2015

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chapter 7 – cyu

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Chapter 11 and 12-2 Review/Study Guide for Test
Chapter 11 and 12-2 Review/Study Guide for Test

... 1. List the major discovery or accomplishment associated with of each of the following scientists: a. Democritus – named the atom, stated it was indivisible b. Dalton – atom is positively charged sphere - said atoms of different elements are different, atoms of the same element are the same c. Thoms ...
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Exam 1 Review Questions
Exam 1 Review Questions

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element - Mrs. Phillips` Physical Science Webpage
element - Mrs. Phillips` Physical Science Webpage

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Atomic Structure AKS Correlation Use the modern atomic theory to
Atomic Structure AKS Correlation Use the modern atomic theory to

... Matter cannot be empty space, dense and its’ makecreated or center up of atoms destroyed Atoms of same element look the same Chem reactions occur when atoms are rearranged Compounds formed by 2 or more atoms Describe the basic structure of the atom as protons, neutrons and electrons in specific arra ...
Atomic Structure and the Periodic Table
Atomic Structure and the Periodic Table

... • Electron cloud – cloud that surrounds the nucleus of an atom that describes the region in which an electron is most likely to be. – Example: students in a school ...
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Dubnium

Dubnium is a chemical element with symbol Db and atomic number 105. It is named after the town of Dubna in Russia (north of Moscow), where it was first produced. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, dubnium-268, has a half-life of approximately 28 hours.In the periodic table of the elements, it is a d-block element and in the transactinide elements. It is a member of the 7th period and belongs to Group 5. Chemistry experiments have confirmed that dubnium behaves as the heavier homologue to tantalum in group 5. The chemical properties of dubnium are characterized only partly. They are similar to those of other group 5 elements.In the 1960s and 1970s, microscopic amounts of dubnium were produced in laboratories in the former Soviet Union and in California. The priority of the discovery and therefore the naming of the element was disputed between Soviet and American scientists, and it was not until 1997 that IUPAC established ""dubnium"" as the official name for the element.
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