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What does the Periodic Table tell us about elements?
Transcript of What does the Periodic Table tell us about elements?
Two Terms that separate the elements are:
The atomic number tells you how many protons are in the element, which tells you the number of electrons because they have to balance.
2. What does the info in the boxes rep.
The periodic table is an arrangement of chemical elements, organized on the basis of their atomic numbers, electron shell model, and recurring chemical properties. Elements are presented in order of increasing atomic number.
The numbers above the periodic table are the group numbers. Elements in the same group have the same number of valence electrons, which means the elements have similar properties.
The numbers beside the periodic table are the periodic numbers. Moving left to right across a period, atomic radius usually decreases. This occurs because each successive element has an added proton & electron. When moving from left to right across a period, the further right you get the more energy is required to remove an electron because they are more tightly bound.
Elements in the same column do have similar properties. They have the same number of valence electrons which means they have the same bond types and similar chemical reactions.
You can tell they have some similarities because ionization energy tends to decrease as you move down a column and increase as you move across a period from left to right.
The periodic table tells us:
Number of Protons, Neutrons, and Electrons
Class/Period (reaction characteristics and element properties)
And the list keeps going.
3. Why are there numbers above and below each row and column?
What can you tell about the electrons?
Do the elements in a column have similarities? What are they and how can you tell?