Chapter 3 Atomic structure.

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Presentation transcript:

Chapter 3 Atomic structure

Student check In your own words what do you think the “Big Bang Theory” is?

Structure of the Atom There are two regions The __________________ ________ and ________ Positive charge/ protons Almost all the mass is found in the Nucleus 2. ___________________________- Most of the volume of an atom.The region where the electron can be found

Counting the Pieces ___________________ Number = number of protons # of protons determines kind of atom the same as the number of electrons in the neutral atom _____________________ Number = the number of protons + neutrons All the things with mass

Student What do you know about the atom? What do you know about the nucleus?

Isotopes Dalton was wrong. Atoms of the same element can have different numbers of ______________ different ___________________ called __________________

Student What is the mass number? What two parts of the atom make up most of the mass of an atom?

X Symbols ______ number ______ number Contain the symbol of the element, the mass number and the atomic number ______ number X ______ number

F Symbols 19 9 Find the number of protons number of neutrons number of electrons Atomic number Mass Number 19 F 9

Br Symbols 80 35 Find the number of protons number of neutrons number of electrons Atomic number Mass Number 80 Br 35

Symbols if an element has an atomic number of 34 and a mass number of 78 what is the number of protons number of neutrons number of electrons Complete symbol

Symbols if an element has 91 protons and 140 neutrons what is the Atomic number Mass number number of electrons Complete symbol

Symbols if an element has 78 electrons and 117 neutrons what is the Atomic number Mass number number of protons Complete symbol

Naming Isotopes Put the mass number after the name of the element carbon- 12 carbon -14 uranium-235

Student What is the. What is an isotope? Atomic number Mass number number of protons Complete symbol What is an isotope? What questions do you still have?