SL Chemistry Tuesday September 22nd 2015. Agenda Begin Topic 2 - Atomic Structure.

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Presentation transcript:

SL Chemistry Tuesday September 22nd 2015

Agenda Begin Topic 2 - Atomic Structure

Topic 2.1 The nuclear atom Atoms contain a positively charged dense nucleus composed of protons and neutrons (nucleons). Negatively charged electrons occupy the space outside the nucleus. The mass spectrometer is used to determine the relative atomic mass of an element from its isotopic composition.

The nuclear atom Subatomic particles and descriptions of the atom Atoms consist of three types of subatomic particle: proton neutron (discovered by British physicist James Chadwick, 1932) electron Masses are in atomic mass units (amu) 1 amu = x g Subatomic Particle ChargeMass/amuLocation proton+1~1nucleus neutron0~1nucleus electron1/1836 outside nucleus in electron cloud

Atomic Model Energy Levels Click me

The nuclear atom Subatomic particles and descriptions of the atom The atomic number, Z Atoms each have their own unique atomic number, Z The atomic number is the number of protons in the nucleus of the atom of an element. In a neutral atom (no overall charge) the number of electrons is equal to the number of protons. Z for oxygen is 8, oxygen has 8 protons and 8 electrons (-8)+(+8) = 0 (neutral) The mass number, A The mass of the atom comes from the nucleus, which contains the protons and neutrons. The mass number, A, is the number of protons + number of neutrons Z for fluorine, F, is 9, fluorine has 9 protons and 9 electrons A for fluorine-19 is 19. Therefore, fluorine has 19-9=10 neutrons

The nuclear atom Subatomic particles and descriptions of the atom The nuclear symbol includes both A and Z for a particular element X and is represented like this: X A Z Isotopes are different forms of the same element but have different number of neutrons (different mass numbers, A) Hydrogen has three isotopes: H (tritium) proton, 1 electron, 2 neutrons H (deuterium) proton, 1 electron, 1 neutron H (hydrogen) proton, 1 electron, 0 neutrons

The nuclear atom Just know the 3 isotope names, abundance, and # of p, e, and n Isotope enrichment: Nuclear energy and nuclear weapons Uranium found in nature consists of three isotopes with the relative abundances and atomic composition found below: Uranium-235 is used in nuclear reactors where it undergoes fission (splitting) with the release of a large amount of energy. Natural uranium has a much higher abundance of U-238 than U-235 so uranium ore may be enriched to increase the proportion of U The separation of natural uranium into enriched uranium and depleted uranium is the physical process of isotope separation. Because they are the same element, the isotopes have the same chemical properties but they show different physical properties due to their different mass numbers. Isotope Relative abundance Number of protons Number of electrons Number of neutrons 234 U0.0055%92 protons92 electrons142 neutrons 235 U0.7200%92 protons92 electrons143 neutrons 238 U %92 protons92 electrons146 neutrons

The nuclear atom Radioisotopes Boron has numerous radioisotopes (radioactive isotopes) Boron-10, Boron-11, Boron-8, Boron-9, Boron- 12, Boron-13 Radioisotopes are used in nuclear medicine for diagnostics, treatment, and research. Iodine-131 is used as a tracer for thyroid issues Carbon-14 is used for age determination in archaeology, geology, geophysics, and other branches of science

The nuclear atom Mass spectrometer

Mass Spectrometer vaporizationionizationaccelerationdeflectiondetectionProcess vaporizerionizeracceleratordeflectordetectorEquipment the atom is changed into a gaseous state the atom is bombarde d by a beam of electrons to form positive ions the positive ions will pass through an electrical field where it will be accelerated the positive ions will pass through a magnetic field where the lighter ions will be deflected more than the heavier ions the difference ions will be detected Details

Practice Problem... I Do... Boron has two naturally occurring isotopes with the natural abundances shown below: IsotopeNatural Abundance/% 10 B B80.1 relative atomic mass = (10 x ) + (11 x ) = Calculate the relative atomic mass of boron:

Practice Problem... We Do... Rubidium has a relative atomic mass of and consists of two naturally occurring isotopes, 85 Rb (u=84.91) and 87 Rb (u=86.91). Calculate the percentage composition of these isotopes in a naturally occurring sample of rubidium. A r = = 84.91x (100-x) x 100 =84.91x (100-x) 8547 =84.91x x -2.00x =-144 x =72.00 The sample contains 72.00% 85 Rb and 28.00% 87 Rb u = atomic mass unit

Topic 2.1 The nuclear atom ➡ Atoms contain a positively charged dense nucleus composed of protons and neutrons (nucleons). ➡ Negatively charged electrons occupy the space outside the nucleus. ➡ The mass spectrometer is used to determine the relative atomic mass of an element from its isotopic composition.