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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: 36 17 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.
Isotope Notation Isotope Notation uses a symbol to convey information about an isotope of a particular element. 23 Na 11.
4.3: HOW ATOMS DIFFER ATOMIC NUMBER
Atomic Structure Section The Nucleus Nucleus- contains most of the mass of an atom – Protons & Neutrons contains most of an atom’s mass – Electrons-
Atomic Structure Nucleus – contains protons and neutrons
OF PROTONS, NEUTRONS AND ELECTRONS IN AN ATOM
Atomic Mass & Number Isotopes The Periodic Table.
Protons, neutrons, electrons too Make up the atoms all around you!
Introduction to Chemistry for Allied Health Sciences Structure of the Atom Kirk Hunter Chemical Technology Department Texas State Technical College Waco.
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.
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
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 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 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.
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.
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.
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