Isotopes. If you change the number of…It will affect the…And the result will be… ProtonsAtomic numberA different element.

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Presentation transcript:

Isotopes

If you change the number of…It will affect the…And the result will be… ProtonsAtomic numberA different element

If you change the number of…It will affect the…And the result will be… ProtonsAtomic numberA different element ElectronsChargeAn Ion

If you change the number of…It will affect the…And the result will be… ProtonsAtomic numberA different element ElectronsChargeAn Ion NeutronsAtomic MassAn Isotope

Isotopes Are atoms that have the same number or protons but a different number of neutrons

Isotopes Are atoms that have the same number or protons but a different number of neutrons Do the number of protons ever change in an isotope?

When you change the number of neutrons… You are changing the atomic mass of the atom!

Why does the atomic mass on the PT have so many decimal places? Because it is an average of all of the different isotopes of that element!

Think of it like averaging your grades Homework 1: 90 Homework 2: 100 Quiz 1: 85 Quiz 2: 95 Test 1: 85 HW is worth 20% Quizzes are worth 30% Test are worth 50%

Percent Abundance Is how often something occurs in nature It is important to consider how much of each isotope of an element exists in nature. It will affect the average in the same way weighing a test more than a quiz will.

So how do you find the atomic mass of an element? The formula: (Mass of isotope 1)(Percent abundance/100) + (Mass of isotope 2)(Percent abundance/100) + (Mass of isotope 3)(Percent abundance/100) = Atomic mass

Let’s work an example together… (Work example from notes on the board together)

How do you find how many neutrons an isotope has? Sometimes you will see this notation: Element - # The number stands for the mass number. Mass number = protons + neutrons (remember?!)

Examples (first one on your practice handout) Chromium-58Chromium-63 Protons Nuetrons Electrons

Examples (first one on your practice handout) Chromium-58Chromium-63 Protons24 Nuetrons3439 Electrons24