ATOMS AND ELEMENTS AT A GLANCE

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Information about ATOMS AND ELEMENTS AT A GLANCE
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Published on September 5, 2008

Author: Christianupdate

Source: authorstream.com

ATOMS AND ELEMENTS : ATOMS AND ELEMENTS Define Particle, Atom, Element, Compounds and Periodic table. Contents of Slide Presentation Intro Atoms & Elements Atoms – What are atoms About an atom Atoms & Shells Subatomic Particles Compounds and Chemical Elements Quick Quiz Atomic Number Atomic Number Calculations Mass Number Calculations Neutral Atom Copy right © Science-tutors Media 2008 ATOMS : ATOMS What are ATOMS? Atoms are the basic building blocks or tiny particles (whose size are hard to imagine or even comprehend) that makes up matter (everything) in the universe. Copy right © Science-tutors Media 2008 ABOUT AN ATOM(SUBATOMIC PARTICLES) : ABOUT AN ATOM(SUBATOMIC PARTICLES) Note keywords: Basic, building, blocks, particles, matter, microscopic (size is hard to imagine) PROTONS NEUTRONS ELECTRONS Think of the sun with the planets spinning around it -this is how best you can probably describe and understand what an atom is. + Charge Charge Neutral Atomic Particles NUCLEUS Copy right © Science-tutors Media 2008 ATOMS AND SHELLS : ATOMS AND SHELLS Electrons stay in their shells as they revolve round the nucleus because a special force (electrostatic force) holds them there. Protons (+ve charge) and electrons (- ve charge) are attracted to each other. SUBATOMIC PARTICLES - PROTONS, ELECTRONS and NEUTRONS Subatomic particles in all atoms are smaller than the atom itself. Copy right © Science-tutors Media 2008 SUBATOMIC PARTICLES(MEMORY TIPS) : SUBATOMIC PARTICLES(MEMORY TIPS) An easy way to remember this is Proton and Positive start with the letter ‘P’ Neutrons have no electrical charge. An easy way to remember this is Neutron and no electrical charge start with the letter ‘N’ Orbiting or circling/moving around outside the nucleus are tiny little particles called electrons Copy right © Science-tutors Media 2008 Compounds & Chemical Elements : Compounds & Chemical Elements What are chemical elements? What are compounds? How are chemical elements different from compounds? All materials or matter that is composed of only one type of atom is called a chemical element or just an element. However, compounds are made when atoms of different elements are chemically joined or combined together. Squashed together in the middle of the atom are protons and neutrons Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah Compounds & Chemical Elements Quick Quiz : Compounds & Chemical Elements Quick Quiz Which of these is an element or a compound? A B C D Compounds are atoms of different elements. Elements are composed of only one type of atom Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah ATOMIC NUMBER : ATOMIC NUMBER What is an atom's atomic number? What is an atom's mass number? Atomic Number is a unique number that identifies how many protons are present in one atom of an element. In science it is defined more precisely as the number of protons in the nucleus of an atom determines an element's atomic number. Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah ATOMIC NUMBER : ATOMIC NUMBER ATOMIC NUMBER = Number of Proton Complete the table below Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah MASS NUMBER : MASS NUMBER What is an atom's mass number? Protons and neutrons are heavy particles which when added together make up an atom’s mass A knowledge of atomic mass essentially tells us how many of these protons and neutrons there are in any atom. + X number of protons Y number of Neutrons = x + y = mass number Mass number tells how many protons and neutrons are there in an atoms. Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah MASS NUMBER : MASS NUMBER Complete the table below NEUTRAL ATOM : NEUTRAL ATOM An atom is in balance or neutral, if it has the same number of protons and electrons. Neutral Atom is when the No. of Protons = No. of Electrons That means number of positive charges = The number of negative charges. So they cancel out and become neutral Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah Neutral Atoms Or Charged Ions : Neutral Atoms Or Charged Ions Copy right © Science-tutors Media 2008 Compilation by Ivan Ukiwah

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