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How to find the number of protons, neutrons, & electrons for an element on the periodic table.

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Presentation on theme: "How to find the number of protons, neutrons, & electrons for an element on the periodic table."— Presentation transcript:

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2 How to find the number of protons, neutrons, & electrons for an element on the periodic table.

3 What is an element? An element is a substance that cannot be broken down into simpler substances by ordinary physical or chemical means. Elements are known as the building blocks of matter. It is made up of protons, neutrons, and electrons. The periodic table is made up of elements.

4 Protons have a positive charge, are located in the nucleus, and have a mass of 1 amu. Remember P +

5 Neutrons have a Neutral charge, are also located in the nucleus, and have a mass of 1 amu Remember N Isn’t this easy!

6 Electrons have a Negative charge, are located on the shells around the nucleus, and have a mass of 0 amu. Nucleus Shells Electrons Remember E-

7 1 H Hydrogen The four parts of the periodic table are: Atomic Number Symbol Element Atomic Mass (Weight)

8 What is the Atomic Number for Carbon (C)? Quick Quiz What is the Atomic Number for Iron (Fe)? What is the Atomic Number for Potassium (K)? What is the Atomic Number for Nitrogen (N)? What is the Atomic Number for Gold (Au)?

9 What is the Atomic Number for Carbon (C)? Quick Quiz What is the Atomic Number for Iron (Fe)? What is the Atomic Number for Potassium (K)? What is the Atomic Number for Nitrogen (N)? What is the Atomic Number for Gold (Au)?

10 Atomic Number 1 H Hydrogen The Atomic Number equals the number of protons and electrons for that element. Hydrogen has 1 proton 1 electron.

11 Atomic Number 6 C Carbon The Atomic Number equals the number of protons and electrons for that element. Carbon has 6 Protons 6 Electrons

12 How many protons does Oxygen have? Quick Quiz How many protons does Calcium have? How many protons does Zinc have? How many protons does Tin (Sn) have? How many protons does Radon have? How many electrons does Oxygen have? How many electrons does Calcium have? How many electrons does Zinc have? How many electrons does Tin (Sn) have? How many electrons does Radon have?

13 How many protons does Oxygen have? Quick Quiz How many protons does Calcium have? How many protons does Zinc have? How many protons does Tin (Sn) have? How many protons does Radon have? How many electrons does Oxygen have? How many electrons does Calcium have? How many protons does Zinc have? How many protons does Tin (Sn) have? How many protons does Radon have?

14 We’ve learned about protons and electrons. What are we missing?

15 Atomic Number 1 H Hydrogen The number of Neutrons equals the Atomic Mass minus the Atomic Number. Atomic Mass - Atomic Number Number of Neutrons

16 This sounds very complicated and I’m confused. That’s O.K. follow these 2 simple steps to help you. Atomic Mass - Atomic Number Number of Neutrons

17 Step 1 1 H Hydrogen Atomic Mass Round the Atomic Mass to the nearest whole number Look at the tenths column. If the number in the tenths column is 5 or greater, then round the number up, if not leave unchanged rounded to the nearest whole number is?

18 Step 2 1 H Hydrogen Find the Atomic Number: Take the rounded Atomic Mass Subtract the Atomic Number Equals the Number of Neutrons

19 Practice 7 N Nitrogen Take the rounded Atomic Mass Subtract the Atomic Number Equals the Number of Neutrons Find the number of Neutrons in Nitrogen:

20 Practice 2 17 Cl Chlorine Take the rounded Atomic Mass Subtract the Atomic Number Equals the Number of Neutrons Find the number of Neutrons in Chlorine:

21 Practice 2 17 Cl Chlorine Take the rounded Atomic Mass Subtract the Atomic Number Equals the Number of Neutrons Find the number of Neutrons in Chlorine:

22 Practice 3 79 Au Gold Take the rounded Atomic Mass Subtract the Atomic Number Equals the Number of Neutrons Find the number of Neutrons in Gold:

23 Practice 3 79 Au Gold Take the rounded Atomic Mass Subtract the Atomic Number Equals the Number of Neutrons Find the number of Neutrons in Gold:

24 Directions: Find the number of Protons, Electrons, and Neutrons for each element listed below. Boron (B) Protons - Electrons - Neutrons - Copper (CU) Protons - Electrons - Neutrons - Indium (In) Protons - Electrons - Neutrons - Plutonium (Pu) Protons - Electrons - Neutrons - Scandium (Sc) Protons - Electrons - Neutrons - Sulfur (S) Protons - Electrons - Neutrons -

25 Directions: Find the number of Protons, Electrons, and Neutrons for each element listed below. Boron (B) Protons - Electrons - Neutrons - Copper (CU) Protons - Electrons - Neutrons - Indium (In) Protons - Electrons - Neutrons - Plutonium (Pu) Protons - Electrons - Neutrons - Scandium (Sc) Protons - Electrons - Neutrons - Sulfur (S) Protons - Electrons - Neutrons -

26 Now you know a little about the periodic table and how to find the number of protons, electrons, and neutrons.


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