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# Anatomy of the atom

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## chris wong

on 20 January 2014

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#### Transcript of Anatomy of the atom

Anatomy of the atom
What is atomic number?

Atomic number is the number of
protons
an atom has.
PRACTICE: Look at periodic table. How many protons does Oxygen have? How many protons does Potassium have?

What is mass number?

The mass number is
protons + neutrons
. (The mass of the nucleus). It is sometimes a decimal number because it is the average for atoms - some atoms have one more neutron than others do.
PRACTICE: How can we use the mass number and atomic number to find out how many neutrons are in an atom?

What is Standard Notation?
Key Points:

Protons and neutrons in the nucleus of atom
Electrons in energy shells orbiting nucleus.
Electrons: negative charge
Protons: positive charge
Usually atom has same number of protons as electrons.
Electrons are tiny (1/1800 the size of a proton)
We cannot change the number of protons an atom has.
But we can change the number of electrons an atom has.

Mass Number
Atomic number
What is an ion?

An ion is when an atom has a different number of electrons and protons.
If an atom has more electrons than protons, it will have a negative charge. (ANION)
If an atom has less electrons than protons, it will have a positive charge. (CATION)
This ion has a negative 2 charge. Q. Does that mean it has more electrons than protons or fewer electrons than protons.

A. It has fewer. It will have 2 fewer
electrons to have a negative charge.
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