Unit 1 Periodic Table Packet 2016.doc

# Atomic mass 12 rounded number of neutrons 12 6 6 to

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Atomic mass: 12 (rounded) Number of neutrons: 12 – 6 = 6 To find the number of electrons, look at the atomic number: Example for carbon: Atomic number: 6 Number of electrons: 6 *Complete the table for the elements with atomic numbers 1-10. ELEMENT NAME ATOMIC NUMBER ATOMIC MASS PROTONS NEUTRONS ELECTRONS 1 2 3 4 5 6 7 8 9 10 6 C carbon 12.011

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*Here’s how to draw an atom of any element using the Bohr model of the atom: Protons and neutrons go in the nucleus (center). Electrons go in energy levels of the electron cloud. The first energy level only holds up to 2 electrons. The second energy level holds up to 8 electrons. The third energy level holds up to 18 electrons. Example for carbon: 6 electrons total First 2 electrons in the 1 st energy level Next 4 electrons in the 2 nd energy level The electrons in the outermost energy level are called valence electrons (V.E.) Example for carbon: 2 nd energy level is the outermost energy level used by carbon Carbon has 4 valence electrons *Draw a picture of an atom for each of the first ten elements and write the number of valence electrons. 1. hydrogen V.E._____ 2. helium V.E._____ 3. lithium V.E._____ 4. beryllium V.E._____ 5. boron V.E._____ 6. carbon V.E._____ 7. nitrogen V.E._____ 8. oxygen V.E._____ 9. fluorine V.E._____ 10. neon V.E._____ P = N =
Assignment 2: Metals, Nonmetals, Dot Diagrams and Ions Metals are on the left side. Non-metals on the right. Metals tend to lose electrons. Non-metals gain them tight. Metals versus Non-Metals

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8 7 The dividing line is the red or bold black line from between Boron and Aluminum down and to the right. Everything to the left is a metal: to the right, non-metal. One exception (don’t ya just hate that?!) is hydrogen – a non-metal. Sodium (Na) is a metal. Oxygen (O) is a non metal. Non-metal (exception) Metals Easy to remember by which side iron (Fe) is on—the left side! On either side of the divide are the metalloids or semi-metals— they have characteristics of both: B, Si, Ge, As. Dot Diagrams (sometimes known as Lewis dot diagrams) are a depiction of an atom’s valence electrons. They are a powerful tool in helping you understand, see, and even predict molecular bonding. Put the correct number of valence electrons around the chemical symbol in this order in pairs: Lithium, with 1 valence electron (first column). 1 5 Notice that the electrons are in pairs not a circle. 4 Ne 3 Why would the electrons spread out around the atom instead of bunching up? C Carbon has 4 valence electrons Oxygen has 6 valence electrons. 2 6 O How many more before it’s full? Neon has 8 valence electrons . (in the right hand column). Neon has no unoccupied spaces. It is full. Draw the Dot Diagrams for the following elements: Beryllium Sodium Helium Carbon Boron M e t a l o r N o n - m e t a l ? P o t a s s i u m : F l u o r i n e : B r o m Dot Diagrams L 1 H Dividing line Non-Metals 2 He 3 Li 4 Be 5 B 6 C 7 N 8 O 9 F 10 Ne 11 Na 12 Mg 13 Al 14 Si 15 P 16 S 17 Cl 18 Ar 19 K 20 Ca 31 Ga 32 Ge 33 As 34 Se 35 Br 36 Kr
If you change the number of protons you change the element .
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