Introduction to Chemistry for Allied Health Sciences Structure of the Atom Kirk Hunter Chemical Technology Department Texas State Technical College Waco.

Slides:

Advertisements

Similar presentations

Atomic Number, Mass Number, Atomic Mass and Isotopes Mrs. Coyle Chemistry.

Advertisements

 An arrangement of elements in which the elements are separated based on properties.

Atomic Structure. What is an atom? Atom: the smallest unit of matter that retains the identity of the substance.

Atomic Structure Nucleus – contains protons and neutrons

Atomic Mass & Number Isotopes The Periodic Table.

Unit II: Atoms and The Periodic Table

Subatomic Particles and Isotopes. Subatomic Particles Protons- Positively Charged Protons- Positively Charged Located in the nucleus Located in the nucleus.

Subatomic Particles. 1. Subatomic Particles ParticleSymbol (table O) ChargeMass (amu) Location Electrons e 0 e -1 0 β -1 Negative (-1) 1/1872 amu 0 amu.

Objectives:  1. Name and describe the three subatomic particles in an atom.  2. Determine the number of protons, neutrons, and electrons in an atom or.

Atoms Atomic Mass/Number Ions/Charges of Molecules Isotopes/Perc ent Abundance

Atomic Structure I. Subatomic Particles.

Mass Number Atomic Number equals the # of... NUCLEUS ELECTRONS PROTONS NEUTRONS NEGATIVE CHARGE POSITIVE CHARGE NEUTRAL CHARGE ATOM.

How Atoms Differ.

Atomic Number, Mass Number, Atomic Mass and Isotopes

Distinguishing Between Atoms

Chapter 3 Atoms and Elements 3.5 Atomic Number and Mass Number 1.

The Atom and Its Parts Physical Science.  The three subatomic particles are:  Proton – Positive charge  Electron – Negative charge  Neutron – No charge.

The three SUBATOMIC PARTICLES are

The Atom What is it made of???. Protons  Positively charged  Mass = 1 amu = 1.67 x grams  Located in the nucleus  Gives an atoms its identity.

Proton A positively charged subatomic particle (found in the nucleus). A subatomic particle with no charge (found inside the nucleus). Neutron.

Masses of Atoms Chapter 19-2 Pages

 Atomic Number- the number of protons in the nucleus of an atom of that element  Ex: Hydrogen atoms have only one proton in the nucleus, so the atomic.

Subatomic Particles. Atomic Particles ParticleChargeMass (kg)Location Electron9.109 x Electron cloud Proton x Nucleus Neutron

Mass Spectrometer. Atomic Number Atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element. Element# of protonsAtomic.

Section 4.3 How atoms differ. Atomic Number Represents three things in a neutral atom: 1. What element it is 2. The number of protons in each atom 3.

Atomic Structure Test Review 166 point total. 1.The atomic number is the number of protons. 2. The mass number is the number of protons and neutrons.

Atomic Number & Atomic Mass

Atomic Structure The Periodic Table, Isotopes, and Average Atomic Mass.

Atoms / Elements Different number of protons Protons found in nucleus # of protons = atomic number Since atom is electrically neutral: #protons = # electrons.

Unit 3: Atomic Structure. A. Subatomic Particles Most of the atom’s mass (Mass Number) NUCLEUS ELECTRON CLOUD PROTONS NEUTRONS ELECTRONS POSITIVE CHARGE.

Isotopes. Let’s Review ProtonsNeutronsElectrons Charge +1 0 Mass 1 amu 0 Location nucleus Electron cloud.

Proton A positively charged subatomic particle (found in the nucleus). A subatomic particle with no charge (found inside the nucleus). Neutron.

Unit 3: The Atom. Atoms All matter is made of very tiny particles All matter is made of very tiny particles These particles have the same properties as.

Notes on Isotopes Remember Protons are (+) and Electrons are (-). Neutrons were the last subatomic particles to be discovered because they have no electrical.

ELECTRONS. Review Electrons were discovered by ______________ Electrons have a ___________ charge Electrons are located…. Outside of the nucleus in an.

Atomic Structure Review Which of the following is NOT true about electrons? a) They have a negative charge b) They are the heaviest subatomic particle.

Atomic Structure and Isotopes. Recap: Atomic Structure An atom is the simplest form of an element that can take part in a chemical reaction Three subatomic.

4.3 Atomic #, Mass #, Atomic Mass & Isotopes. Atomic Number  What are the 3 subatomic particles?  Which of the subatomic particles identifies an element?

1 The Atom Atomic Number and Mass Number Isotopes.

SECTION 4.3 HOW ATOMS DIFFER. PENNIES AS ATOMS MASS OF SAMPLE 1: MASS OF SAMPLE 2: IF THEY HAD THE SAME NUMBER OF PENNIES, WHY WERE THE MASSES DIFFERENT?

Atomic Structure Current Atomic model

Atomic Structure Modern Atomic Theory.

Atomic Structure.

ATOMIC STRUCTURE.

Atomic Structure Subatomic Particles C. Johannesson.

4.2 -Atomic Structure Theory

ATOMIC STRUCTURE.

Subatomic Particles Masses of Atoms Mass Number Isotopes Ions

Atomic Structure Atoms are made of 3 subatomic particles:

Unit 3 – Atoms, Ions, Isotopes

Unit 2: Atomic Theory & Structure

Basic Atomic Structure

Subatomic Particles.

H H H Isotopes element: same or different mass:

Subatomic Particles.

ATOMS AND ATOMIC STRUCTURE Atom Nucleus Proton Neutron Electron

Ch. 3 - Atomic Structure II. Masses of Atoms (p.75-80) Mass Number

Atoms and Subatomic Particles

Atomic Structure Nucleons Atomic Number

Atomic Number, Mass Number, Atomic Mass and Isotopes

Distinguish Between Atoms

Ch. 4 - Atomic Structure II. Masses of Atoms Mass Number Isotopes

Subatomic Particles.

Atomic Particles Particle Charge Mass (kg) Location Electron -1

Counting Subatomic Particles

Presentation transcript:

Introduction to Chemistry for Allied Health Sciences Structure of the Atom Kirk Hunter Chemical Technology Department Texas State Technical College Waco

Structure of the Atom

Subatomic Particles NameRelative Relative Mass (amu) Charge Proton1+1 Neutron1 0 Electron0-1

ATOM The protons and neutrons are located in the center in the region called the nucleus.

ATOM Electrons are found around the nucleus in shells or principle energy levels (PEL).

ATOMIC NUMBER The number of protons in the nucleus of an atom Z = #p

ATOMIC NUMBER For a neutral atom, the number of protons is equal to the number of electrons. #p = #e

MASS NUMBER The sum of protons and neutrons in the nucleus of an atom. A = #p + #n

MASS NUMBER Round the atomic weight to the nearest whole number ElementAtomic MassMass Number Li6.941 Ca B10.81 Au

Isotopic Notation A = mass number E = symbol of element Z = atomic number E A Z

Isotopic Notation Example: Determine the number of protons, electrons and neutrons in V.

Isotopic Notation Example: Determine the number of protons, electrons and neutrons in V. Solution: # p = 23 # e - = 23 # n = = 28

Isotopic Notation Example: Determine the number of protons, electrons and neutrons for the following: 14 7 N U Na Hg

Isotopic Notation Example: Determine the number of protons, electrons and neutrons for the following: 14 7 N U Na Hg #p #e - #n

Isotopes Around 20 elements have a fixed number of neutrons. Atoms of the same element having a different number of neutrons are called isotopes. Isotopes have the same number of protons and a different number of neutrons.

Isotopes of Hydrogen 1 1 H 2 1 H 3 1 H Protium Deuterium Tritium p n e

Isotopes of Helium 3 2 He 4 2 He p n e - 2 2

Isotopes of Oxygen 16 8 O 17 8 O 18 8 O p n e

ATOMIC MASS UNIT Carbon-12 used as the reference standard. All atoms are compared to C amu = 1/12 the mass of a C-12 atom.

ATOMIC MASS The average mass of all isotopes of the element. –exact mass of each isotope –percent abundance of each isotope in nature

ATOMIC MASS Example: Determine atomic mass of vanadium. Isotopeexact mass% abundance 51 V amu 35.64% 52 V amu 64.36% At.wt.=( *0.3564) + ( * ) = = amu

ATOMIC MASS Example: Determine atomic mass of silicon. Isotopeexact mass% abundance 26 Si amu5.435% 28 Si amu76.42% 29 Si amu18.15% At.wt. = ( * )+( *0.7642) +( *0.1815) = amu