Atomic Structure.

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Presentation transcript:

Atomic Structure

Overview of topic Atomic Structure Ions Electronic Structure and the Periodic Table Structure of Atoms Atomic Structure Electronic Arrangement Isotopes

Today’s Menu What is an atom Structure of an atom Relative charges and approximate relative masses of proton, neutron and an electron Symbol of an atom Proton number, nucleon number

What is an atom?

What is an atom All matters are made up of atoms Atoms are extremely small in size

What is an atom Picture of lithium atoms in the compound lithium cobalt oxide Taken with a transmission electron microscope, which can magnify objects up to 500,0000 times

What is an atom An atom consists of 3 subatomic particles: Protons Neutrons Electrons Atom is a particle which is electrically neutral No. of protons = No. of electrons

Structure of an Atom

Structure of an Atom Protons and Neutrons + Electrons Nucleus Shells

Structure of an Atom Shells

Structure of an Atom Shells Electrons

Structure of an Atom Protons and Neutrons + Electrons Nucleus Shells

Structure of an Atom

Relative charges and approximate relative masses

Particle Charge Relative Mass Remarks Proton (p) +1 1 Mass is the same as that of a hydrogen atom Found in the nucleus of the atom Neutron (n) Electron (e-) -1 1/1840 (negligible) One hydrogen atom weighs as much as 1836 electrons Found around the nucleus.

Symbol of an atom

Symbol of an atom Chemical Symbol Nucleon Number Proton Number E.g.

Proton number, nucleon number

Proton number Proton number (atomic number) The number of protons in an atom For an atom, no. of protons = no. electrons

Nucleon number Nucleon number (mass number) = no. of protons + no. neutrons No. of Neutrons = Nucleon number – Proton number

Example Given , (a) What is the proton number? Ans: 29 What is the number of electrons in Cu atom? Ans: 29 (c) What is the nucleon number? Ans: 64 (d) What is the number of neutrons? Ans: 64-29=53

Summary

Summary Structure of an atom Relative charges and approximate relative masses of protons, neutrons and electrons + Electrons Nucleus Protons and Neutrons

Summary Symbol of an atom Proton number, nucleon number Nucleon Number Chemical Symbol Nucleon Number Proton Number

Any Questions