14.1 Structure of the Atom  In order to understand atoms, we need to understand the idea of electric charge.  We know of two different kinds of electric.

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Presentation transcript:

14.1 Structure of the Atom  In order to understand atoms, we need to understand the idea of electric charge.  We know of two different kinds of electric charge and we call them positive and negative.

14.1 Electric charge in matter  We say an object is electrically neutral when its total electric charge is zero.

14.1 An early model  In 1897 English physicist J. J. Thomson discovered that electricity passing through a gas caused the gas to give off particles that were too small to be atoms.  These negative particles were eventually called “electrons.”

14.1 The nuclear model  In 1911, Ernest Rutherford, Hans Geiger, and Ernest Marsden did a clever experiment to test Thomson’s model.  We now know that every atom has a tiny nucleus, which contains more than 99% of the atom’s mass.

14.1 Inside an atom  The mass of the nucleus determines the mass of an atom because protons and neutrons are much larger and more massive than electrons.  In fact, a proton is 1,836 times heavier than an electron.

14.1 Force inside atoms  Electrons are bound to the nucleus by the attractive force between electrons (-) and protons (+).

14.1 Force inside atoms  What holds the nucleus together?  There is another force that is even stronger than the electric force.  We call it the strong nuclear force.

14.1 How atoms of various elements are different  The atoms of different elements contain different numbers of protons in the nucleus.  Because the number of protons is so important, it is called the atomic number.

14.1 How atoms of various elements are different  Isotopes are atoms of the same element that have different numbers of neutrons.  The mass number of an isotope tells you the number of protons plus the number of neutrons. How are these carbon isotopes different?

14.1 Radioactivity  Almost all elements have one or more isotopes that are stable.  “Stable” means the nucleus stays together.  Carbon-14 is radioactive because it has an unstable nucleus.

Solving Problems  How many neutrons are present in an aluminum atom that has an atomic number of 13 and a mass number of 27?

1.Looking for:  …number of neutrons in aluminum-27 2.Given  … atomic no. = 13; mass no. = 27 3.Relationships:  Periodic table says atomic no. = proton no.  protons + neutrons = mass no. 4.Solution  neutrons = mass no. – protons  neutrons = 27 – 13 = 14 Solving Problems