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Atomic Number, Mass Number, Atomic Mass and Isotopes Mrs. Coyle Chemistry
Atomic Number (Z): is the number of protons in the nucleus of the atom. Z=#p
The number of protons (atomic number) determine the identity of an element.
Atoms have no overall electrical charge so, an atom must have as many electrons as there are protons in its nucleus.
The atomic number of an element also equals the number of electrons in a neutral atom of that element.
Ex: Sodium What is the atomic number of Sodium? How many protons does sodium have? How many electrons does sodium have?
Mass Number (A): The sum of the protons and neutrons in the nucleus. A=#p + #n
Other ways to write elements: ClCl-36 Atomic Number Mass Number
Nucleons: protons and neutrons
Isotopes of an element have different mass numbers because they have different numbers of neutrons, but they have the same atomic number.
Example: Isotopes of Carbon and Hydrogen protium deuteriumtritium HH H Isotopes of Carbon Isotopes of Hydrogen
Atomic Mass Unit is a unit used to compare the masses of atoms and has the symbol u or amu.
1 amu or u is approximately equal to the mass of a single proton or neutron.
Carbon-12 Chemists have defined the carbon-12 atom as having a mass of 12 atomic mass units.
1 u = 1/12 the mass of a Carbon-12 atom.
Atomic Mass is the weighted average mass of all the naturally occurring isotopes of that element.
Atomic Number, Mass Number, Atomic Mass and Isotopes.
Do Now (In your Tracker) Read the article and underline any words that you do not know. Answer the following questions: 1. What is the main idea of the.
Atomic Mass & Number Isotopes The Periodic Table.
Atomic Structure Nucleus – contains protons and neutrons Electron Cloud – area where electrons are found Neutron – particle with no charge Proton – positively.
The Atom. What’s Inside an Atom The Nucleus The nucleus is the small dense, positively charged center of the atom. It contains most of the atom's mass.
Parts of the Atom: Properties Protons: –Positive charge –Located in nucleus –Mass = 1 amu (Atomic Mass Unit) Neutrons –No charge (neutral) –Inside.
Mass Number Atomic Number equals the # of... NUCLEUS ELECTRONS PROTONS NEUTRONS NEGATIVE CHARGE POSITIVE CHARGE NEUTRAL CHARGE ATOM.
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.
Atomic Structure I. Subatomic Particles. Subatomic Particles Most of the atom’s mass. NUCLEUS ELECTRONS PROTONS NEUTRONS NEGATIVE CHARGE POSITIVE CHARGE.
Atomic Structure What are atoms made of? How are atoms put together? What are Elements? Isotopes?
ELECTRONS. Review Electrons were discovered by ______________ Electrons have a ___________ charge Electrons are located…. Outside of the nucleus in an.
Atoms / Elements Different number of protons Protons found in nucleus # of protons = atomic number Since atom is electrically neutral: #protons = # electrons.
Notes on Isotopes Remember Protons are (+) and Electrons are (-). Neutrons were the last sub- atomic particles to be discovered because they have no electrical.
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.
Protons, neutrons, electrons too Make up the atoms all around you!
Isotopes. Let’s Review ProtonsNeutronsElectrons Charge +1 0 Mass 1 amu 0 Location nucleus Electron cloud.
4.2. ATOMIC NUMBER Elements are different because they contain different numbers of protons. Atomic number = # protons = # electrons in a neutral atom.
Atomic Structure Section The Nucleus Nucleus- contains most of the mass of an atom – Protons & Neutrons contains most of an atom’s mass – Electrons-
Note: When doing calculations never clear your calculator.
Chapter 4.3 Distinguishing Among Atoms. Atomic Number ► Different number of protons in the nucleus is what defines different atoms. ► Atomic Number—the.
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.
LEARNING ABOUT ATOMS BY READING THE PERIODIC TABLE.
4.3 Atomic #, Mass #, Atomic Mass & Isotopes. Atomic Number What are the 3 subatomic particles? Which of the subatomic particles identifies an element?
4.3: HOW ATOMS DIFFER ATOMIC NUMBER Atomic number = number of protons = number of electrons Atomic number defines what the element is Periodic Table is.
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.
Determines the element Number of protons CANNOT change for an element Common charge notation is +1 Mass (g) = x Mass (amu)=
Atomic Structure. What Is An Atom? the smallest particle of an element that retains the chemical properties of that element Can be subdivided into electrons.
Parts of the Atom … from Discovery to Reality. NUCLEUS PROTONS ✚ Positively charged particles Mass = 1 amu NEUTRONS No charge or neutral Mass = 1 amu.
Atomic Mass. Atomic Number (A) Number of protons in the nucleus Atoms of the same element all have the same number of protons In a neutral atom, the total.
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?
Rutherford’s Atom/Past Electrons orbit nucleus similar as planets to the sun Atom of the Present Electrons orbit nucleus in the form of clouds.
How Atoms Differ. 2 What are the subatomic particles? What are their charges? Where are they located? What are their sizes? 2.
DETERMINE THE NUMBER OF PROTONS, NEUTRONS AND ELECTRONS IN AN ATOM.
Section 4.3 How Atoms Differ. Objectives Explain the role of atomic number in determining the identity of an atom Define an isotope and explain why atomic.
Ch. 3 - Atomic Structure II. Masses of Atoms (p.75-80) Mass Number Isotopes Relative Atomic Mass Average Atomic Mass.
Introduction to Chemistry for Allied Health Sciences Structure of the Atom Kirk Hunter Chemical Technology Department Texas State Technical College Waco.
The Atom The smallest particle into which an element can be divided and still retain all of the properties of that element.
UNIT 3: DAY 1 AND DAY 3 ATOMIC STRUCTURE. ATOM, ELEMENTS, AND COMPOUNDS Atoms are the smallest unit of matter In classification, all atoms are elements.
Isotope Notation Isotope Notation uses a symbol to convey information about an isotope of a particular element. 23 Na 11.
Proton A positively charged subatomic particle (found in the nucleus). A subatomic particle with no charge (found inside the nucleus). Neutron.
Reading the Periodic Table. The top number is the atomic number or the number of ______________________ Cl is an abbreviation for ______________________.
How Atoms Differ. a. Properties of Subatomic Particles ParticleSymbolLocationRelative Charge Relative mass Actual mass (g) Electron Proton Neutron.
Atomic Structure Notes Subatomic Particles Subatomic Particles Atomic Number, Atomic Mass & Mass Number Atomic Number, Atomic Mass & Mass Number Symbols.
Unit 3: Atomic Structure. A. Subatomic Particles Most of the atom’s mass (Mass Number) NUCLEUS ELECTRON CLOUD PROTONS NEUTRONS ELECTRONS POSITIVE CHARGE.
Atomic Structure The Periodic Table, Isotopes, and Average Atomic Mass.
Atomic Structure. Atomic number – the number of protons in the nucleus of an atom ( ID of element ) Mass number– sum of protons and neutrons in an.
Chapter 3 Isotopes Part II. Atoms Nucleus is center core. Nucleus is center core. Nucleus is made of Protons & Neutrons. Nucleus is made of Protons &
The Nuclear Atom Atoms differ from one another by their number of: 1.Protons 2.Neutrons 3.Electrons Electrons have a NEGATIVE charge. The MASS of an electron.
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.
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