ATOM STRUCTURE AND PROPERTIES OF ELEMENTS

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Published on March 14, 2014

Author: sofipaz1

Source: slideshare.net

Atoms Their structure and the properties of elements An element smallest posible piece… Miss Sofia Paz

First: Different elements or compounds have different properties: States (luquid, solid, gas, plasma) this properties depend on the atoms of the elements! MADE UP OF SUBATOMIC PARTICLES: -PROTONS(+) -NEUTRONS -ELECTRONS(-) ATOM: Smallest possible piece of an element (without loosing their properties)

The attraction of the negatively charged electrons and the positively charged protons keeps the electrons close to the nucleus.

How this subatomic particles form an ATOM? -NUCLEOUS: NEUTRONS, PROTONS(+), -CLOUD OF ELECTRONS (-) The attraction of the negatively charged electrons and the positively charged protons keeps the electrons close to the nucleus. Electrons have less mass than neutrons and protons.

NOT constantConstant ATOMIC NUMBER (Z)( NUMBER OF PROTONS) # of # of The number of protons is constant in each element The atom is electrically neutral, positive charges are balanced with the negative charges. NO two elements have the same atomic number the number of protons = the Atomic Number(Z)

ISOTOPES (when the number of neutrons change) Alternate forms of elements (always same proton number but different neutron number) Why C14, C13, C12??? Is the NUCLEAR NUMBER: NUMBER OF PROTONS + NUMBER OF NEUTRONS

RADIOACTIVE ISOTOPE: HOMEWORK FOR NEX CLASS! What are radioactive isotopes and What uses does they have? CONCEPT :CHEMICAL PROPERTIES ARE BASED ON STRUCTURE OF ATOMS

ElECTRONS AND REACTIVITY: Electrons properties: -amount of energy -how thigly they are held by protons Depending on this properties electrons belong to differents energy leves: I energy level can hold up to 2 electrons II energy level can hold up to 8 electrons III energy level can hold up to 18 electrons HOW DOES ATOMS STRUCTURE DETERMINE HOW IT REACTS??

CONCEPT :CHEMICAL PROPERTIES ARE BASED ON STRUCTURE OF ATOMS I energy level :2 electrons II energy level: 8 electrons III energy level : 18 electrons

ATOM SONG! 3.21 MIN  https://www.youtube.com/watch?v=O5iaw5WNuB0

CONCEPT :CHEMICAL PROPERTIES ARE BASED ON STRUCTURE OF ATOMS Element/ isotope Atomic Number Protons Neutrons Total electrons (same number ofprotons+) Electrons in the highest level 12C 6 14C 14N 7 16O 8 P 15 15 S 16 16

Just howsmall is an atom??  http://www.youtube.com/watch?v=yQP4UJhNn0I  DOGS TEACHING CHEMSITRY  http://www.youtube.com/watch?v=addK0b2Isw8

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