Presentation is loading. Please wait.

Presentation is loading. Please wait.

ATOMIC STRUCTURE An atom is the smallest particle of matter that retains the properties of the element. An atom is composed of ______ subatomic particles.

Similar presentations


Presentation on theme: "ATOMIC STRUCTURE An atom is the smallest particle of matter that retains the properties of the element. An atom is composed of ______ subatomic particles."— Presentation transcript:

1 ATOMIC STRUCTURE An atom is the smallest particle of matter that retains the properties of the element. An atom is composed of ______ subatomic particles.

2 ATOMIC STRUCTURE In a neutral atom, the # of electrons must equal the # of ___. The identity of the atom is based on the # of _________________. PARTICLEMASSCHARGE ELECTRONVirtually none (1/1840) Negative PROTON1 AMUPositive NEUTRON1 AMU (slightly more massive than proton) neutral

3 ATOMIC STRUCTURE When atoms of the same element contain different #s of neutrons they are called __________. An atom has an overall charge of ____. When an atom loses or gains electrons, an ___________ forms. A cation forms when an atom loses electrons. (+ charge) An anion forms when an atom gains electrons. (- charge)

4 Nucleus Contains Protons (p + ) and Neutrons (n) the mass of the atom Electron Cloud Region around nucleus where electrons (e - ) move the volume of an atom Atomic Structure 1 st energy level (2 e - ) 2 nd energy level (8 e - ) 3 rd energy level (18 e - ) 4 th energy level (32 e - )

5 Electron Energy Levels ENERGY LEVEL# OF ELECTRONS 12 electrons 28 electrons 318 electrons 432 electrons 5 Valence electrons are the electrons in the outer most energy level.

6 C 6 12.001 Atomic Number: # of protons in nucleus (also the # of electrons) Average Atomic Mass: average mass of the mixture of isotopes Chemical Symbol: abbreviation for the name of an element (1 st letter caps, 2 nd letter lower case)

7 12 6 C 14 6 C Mass Atomic number Isotopes of Carbon

8 Atomic Calculations Element Atomic # # of Protons # of Electrons Charge on nucleus Mass number Number of neutrons He24 2039 3545


Download ppt "ATOMIC STRUCTURE An atom is the smallest particle of matter that retains the properties of the element. An atom is composed of ______ subatomic particles."

Similar presentations


Ads by Google