![]() #Sheppardsoftware ion bonding full#OCTET RULE Valence electrons follow the octet rule, which states that atoms are most stable when they have a full set of valence electrons which is usually 8ĭiscovering a Pattern In 1869, Russian chemist Dmitri Mendeleev arranged the elements in order of increasing atomic mass. VALENCE ELECTRONS Fill their valence shell !!!! HUH? An Ion is a particle that is electrically charged (+ or -) due to a loss or gain of electrons.ĮLECTRONS AND IONS A negative ion is one that has gained electrons and therefore has extra negative charge=anionĪ positive ion is one that has lost electrons and therefore has extra positive charge=cation This makes atoms more stable ELECTRONS When atoms give up or take electrons they are no longer neutral because the number of electrons does not equal the number of protons. MAKING FRIENDS Elements try to fill there valence electron shell by gaining or losing electrons, or by sharing electrons with other atoms. This explains why they are important in chemical bonding VALENCE ELECTRONS Electrons in outer shells have higher average energy and travel farther from the nucleus than those in inner shells. Only this outer shell or valence electrons reacts with other atoms to form chemical bonds VALENCE ELECTRONS The electrons contained in the outermost shell of an atom are called valence electrons. The nucleus is a solid core, and that core is covered by shells of electrons. So we have 3 different versions of neon: o 10 protons, 10 neutrons o 10 protons, 11 neutrons (1 extra) o 10 protons, 12 neutrons (2 extra)ĮLECTRONS AND BONDING Atoms can be viewed as onions. These extra neutrons have no effect on the chemical properties of the atoms but they do affect the weight of the atom. Isotopes Atoms with the same number of protons but different number of neutrons are called isotopes. UNDERSTANDING CHANGES IN NUMBER OF NEUTRONS & ELECTRONS Others refer to older names for the element in different languages like Greek or Latin. Some are very easy to figure out, like H for hydrogen or O for oxygen. READING THE BOXES The symbol for the element may be either one capital letter or a combination of one capital and one lowercase letter. The Boxes that Make Up the Periodic Table? There are 4 very specific items that appear for each element. The Periodic Table and Trends of the Elements Structure of the Atom Chapter 19 Section 1. Scientists have identified 90 naturally occurring elements, Properties of G R O U P S The Periodic Table Part II.Įlements The elements, alone or in combinations, make up our bodies, our world, our sun, and in fact, the entire universe.Įlements Science has come along way since Aristotle’s theory of Air, Water, Fire, and Earth. Periods and Families of the Periodic Table The Periodic Table and How it is Organized. Introduction to Matter: Chapter 5: The Periodic Tableĭmitri Mendeleev The Father of the Original Periodic Warm Up Describe how the periodic table is arranged. Quick Question: Who developed the Periodic Table of Elements? The Father of the Periodic Table- Dmitri Mendeleev Mendeleev ( ) was the first scientist to notice. The Periodic Table Introduction and Overview. Subatomic Particles Proton Positive charge + Mass of 1 amu Found in the nucleus # of protons = atomic number 11 Na Sodium. Based on increasing Atomic Mass.Ītomic Structure. Dmitri Mendeleev Born: Siberia in 1834 and died in Mendeleev is best known for his work on the periodic table ĭmitri Mendeleev The Father of the Original Periodic Table (1869). Periodic Table of Elements: Family Properties It contains… Protons – Positively charged particles. Pages What are the parts of an atom? Nucleus – The center of the atom. D’Mitri Mendeleev 1860’s First to publish Placed similar elements in same vertical column Left open spaces for elements he predicted. How is the Periodic Table of Elements Organized? SECTION 1 Dmitri Mendeleev: Russian chemist who discovered a pattern to the elements in Arranged the elements by density, Instructional Objective: 1.Understand the periodic chart 2.Learn about valance electrons.įamilies on the Periodic Table Elements on the periodic table can be grouped into families bases on their chemical properties. ** You need to add what is in RED to your notes The History and Arrangement of the Periodic Table Chapter 7 State Standards: 3.f 7.a 7.b 7.c 1Contreras. ![]()
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