The Atom The Atom n The atom has
- Slides: 26
The Atom
The Atom n The atom has three parts: Protons 2) Neutrons 3) Electrons 1)
Protons n 1) 2) 3) Protons: Found in the nucleus Mass: one (1) Atomic Mass Unit have a (+) positive charge, 1 PROTON = 1 POSITIVE Charge
Protons (Cont’d) n On the periodic table, each element is numbered. This number equals the number of Protons in the nucleus.
Neutrons n n n Also found in the nucleus. Mass: one (1) Atomic Mass Unit. They have NO charge. Neutron = Neutral
Electrons n n n Found around the nucleus (like planets around the Sun) An Electron’s mass is almost nothing…almost Have a negative (-) charge ELECTRONS = NEGATIVE
Standard Atomic Notation Mass Number = mass of all the protons and neutrons in the nucleus 9 Be 4 Element Symbol – eg. Beryllium Atomic Number = number of protons in the nucleus and the number of electrons orbiting the nucleus To find the number of neutrons in the nucleus, subtract atomic number from mass number. There would be 9 – 4 or 5 neutrons in a Beryllium atom
Remember n n n The periodic table is organized by atomic number (the number of protons the element has in its nucleus) Protons are + and electrons are The number of protons = the number of electrons (positives = negatives)
Let’s try some! n n Have your periodic table ready How many protons, neutrons and electrons in one atom of: Hydrogen? n Carbon? n Beryllium? n Calcium? n Fluorine? n 1 p+, 1 e-, 0 n 6 p+, 6 e-, 6 n 4 p+, 4 e-, 5 n 20 p+, 20 e-, 20 n 9 p+, 9 e-, 10 n
Bohr-Rutherford Diagrams n n n Named after the work done by Neils Bohr and Ernest Rutherford (nobody before them gets any respect!) Flattened model of the inside of an atom Unique for each atom
Electron Shells First Shell, maximum 2 electrons
Why only 2 in the first shell? 2 elements in first row (period)
Electron Shells Second Shell, Maximum 8 electrons
Why 8 in the second shell? 8 elements in second period
Electron Shells Third shell, max # 8 electrons Note: Magnesium only needs 2 electrons in this shell because it has 12 total
Bohr-Rutherford Diagrams Eg. Magnesium
Guess this element n 82 protons = element 82 which is LEAD
The Noble Gases n Column to the far right of the periodic table, He, Ne, Ar, Kr, Xe, & Rn
So, how would Magnesium look like Neon? Magnesium Neon
n n So, if Mg lost two Electrons, but still had the same number of Protons, what is its Charge? +2
Charges n n The outer electrons on an atom are called: Valence electrons. Atoms want a Bohr-Rutherford Diagram that look like the Noble Gases because… have the most stable structure n Won’t react when mixed n n Usually, this means the atom ends up with a Charge.
Fluorine n What does F need to look like a Noble gas? If we add one Electron, what will the Charge of the atom be? n -1 n
Ions n n Ion= a Charged atom in which the number of ELECTRONS (-) is different from the number of PROTONS (+). Ionic Charge= is the number of positive (+) or negative (-) Charges on an atom. Ex: Mg+2
Groups Mg Be (Berylium)
So… n n n Even though each element has a different # of PROTONS and ELECTRONS, each element in a group has a similar Bohr. Rutherford Diagram This means they want to gain or lose the same number of Electrons. It also means elements in a Group will react similarly in Chemical Reactions
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