# Periodic table 5 - PowerPoint PPT Presentation

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Periodic table 5. Isotopes pp 116-119. Review of Atomic Structure. Nucleus Protons have a positive (+1) charge Neutrons have no charge Electrons Electrons have a negative (-1) charge Much smaller mass Located outside the nucleus. Protons.

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Periodic table 5

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## Periodic table 5

Isotopes

pp 116-119

### Review of Atomic Structure

• Nucleus

• Protons have a positive (+1) charge

• Neutrons have no charge

• Electrons

• Electrons have a negative (-1) charge

• Much smaller mass

• Located outside the nucleus

### Protons

• When you change the number of protons, you change the element.

• The atomic number (Z) is the whole number on the periodic table.

• Hydrogen Z = 1

• Calcium Z = 20

• What is the atomic number of Silicon?

• Oxygen?

• How many protons does Magnesium have?

### Electrons

• A neutral atom has the same number of electrons as protons.

• Z x (+1) + Z x (-1) = 0

• When an atom gains or looses electrons, it has a charge. It is called an ion.

• The monatomic ion forms based on its valence.

• They want the “easiest” way to have 8 in its outer shell.

• The valence of Sodium (Na) is 1. What Ion will it form?

### Neutrons

• All atoms of the same element will have the same number of protons. (atomic number, Z)

• Atoms of the same element may have a different number of neutrons.

• If you change the number of neutrons, you change the:

• massnumber of the element

• The isotope of the element

### Vocabulary

• Mass Number – the number of protons plus the number of neutrons

• Isotope – an atom that has the same number of protons but a different number of neutrons