18 Ion
July 27th, 2009
18 Ion
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 Makita BHP454 LXT 18V 30Ah Lithium Ion Hammer Drill $185.00 Time Remaining: 21d 11h 19m Buy It Now for only: $185.00 |
 DEWALT DCD970KL 18V XRP LITHIUM ION CORDLESS HAMMER DRILL DRIVER New $199.99 Time Remaining: 1d 18h 55m |
 HITACHI WR18DL 1 2 CORDLESS 18V IMPACT WRENCH EBM1830 LIT ION BATTERY 18 VOLT $192.97 Time Remaining: 8d 23h 58m Buy It Now for only: $192.97 |
 Bosch 18V Cordless Lithium Ion BruteTough Hammer Drill Driver 17618 01 RT $176.98 Time Remaining: 10d 15h 5m Buy It Now for only: $176.98 |
 DEWALT DCD775 1 2 18 Volt 18V Li Ion Cordless Compact Hammerdrill Drill Driver $69.95 Time Remaining: 5d 13h 58m Buy It Now for only: $69.95 |
 New Milwaukee 2604 22 18V Cordless M18 FUEL Lithium Ion Hammer Drill $279.00 Time Remaining: 12d 14h 34m Buy It Now for only: $279.00 |
 2 NEW HITACHI DS18DL CORDLESS 18V LI ION NICAD DRILLS 18 VOLT BATTERY OPERATED $208.97 Time Remaining: 19d 15h 36m Buy It Now for only: $208.97 |
 Makita 18V Brushless Hammer Drill Driver LXPH05 Li Ion LXT Cordless LXPH05Z NEW $109.99 Time Remaining: 26d 13h 56m Buy It Now for only: $109.99 |
 Milwaukee 18V Cordless M18 FUEL Lithium Ion Hammer Drill 2604 22CT NEW $249.00 Time Remaining: 10d 13h 12m Buy It Now for only: $249.00 |
 Makita 18V 1 2 LXT Li Ion Cordless Hammer Drill BHP452 $59.99 Time Remaining: 3d 11h 48m Buy It Now for only: $59.99 |
 MASTERCRAFT CORDLESS DRILL 18V 14Ah LI ION WITH BATTERY PACK $30.00 Time Remaining: 13d 20h 38m Buy It Now for only: $30.00 |
 MAKITA 18V LXT HAMMER DRILL BHP452 BL1830 BATTERY LITHIUM ION CORDLESS 2 SPD 30 $144.00 Time Remaining: 25d 14h 24m Buy It Now for only: $144.00 |
 Bosch 18V Cordless Lithium Ion Brute Tough Hammer Drill Driver 176108 01 $199.20 Time Remaining: 22d 17h 45m Buy It Now for only: $199.20 |
 Milwaukee M18 1 2Hammer Drill Driver 18V 2602 20 Cordless Red Lithium Li Ion $79.99 Time Remaining: 22d 6h 52m Buy It Now for only: $79.99 |
 Makita 18V Cordless LXT Li Ion 1 2 in Hammer Drill LXPH05Z NEW $116.98 Time Remaining: 29d 21h 13m Buy It Now for only: $116.98 |
 Milwaukee M18 1 2Hammer Drill Driver 18V 2602 20 Cordless Red Lithium Li Ion $40.10 (16 Bids) Time Remaining: 1d 19h 58m |
 NEW HITACHI DS18DL CORDLESS 18V LI ION NICAD DRILL 18 VOLT BATTERY OPERATED $104.97 Time Remaining: 19d 15h 39m Buy It Now for only: $104.97 |
 Makita 18V Cordless LXT Li Ion 1 2 in Hammer Drill Kit LXPH05 NEW $299.99 Time Remaining: 29d 21h 13m Buy It Now for only: $299.99 |
 Bosch 18V Cordless Lithium Ion VSR Compact Tough Drill Kit 36618 02 RT $146.98 Time Remaining: 23d 1h 3m Buy It Now for only: $146.98 |
 Makita 18V 1 2 LXT Li Ion Cordless Hammer Drill BHP454 $89.90 Time Remaining: 3d 11h 53m Buy It Now for only: $89.90 |
 HITACHI DS18DL 18V LI ION DRILLEMB1830 BATTERY 18 VOLT $184.97 Time Remaining: 19d 15h 32m Buy It Now for only: $184.97 |
 DeWALT DCD970KLR Recon DCD970KL 1 2 18V Cordless Li Ion Hammerdrill Driver Kit $279.99 Time Remaining: 24d 14h 21m Buy It Now for only: $279.99 |
 Milwaukee 18V Cordless M18 FUEL Lithium Ion Hammer Drill TO 2604 20 NEW $149.00 Time Remaining: 23d 13h 11m Buy It Now for only: $149.00 |
 Milwaukee 2602 22DC M18 LITHIUM ION 1 2 Hammer Drill Driver Kit AC DC Charger $329.00 Time Remaining: 26d 8h 1m Buy It Now for only: $329.00 |
 NEW HITACHI WR18DL 18V CORDLESS 1 2 IMPACT WRENCH CASE 18 VOLT LIT ION NICAD $134.97 Time Remaining: 21d 13h 9m Buy It Now for only: $134.97 |
 Makita 18V 1 2 LXT Li Ion Cordless Hammer Drill BHP454 $89.90 Time Remaining: 7d 1h 7m Buy It Now for only: $89.90 |
 NEW DEWALT 18V CORDLESS DCD970 HAMMER DRILL DC9180 LI ION BATTERY 18 VOLT XRP $189.97 Time Remaining: 16d 13h 47m Buy It Now for only: $189.97 |
 Makita BHP452 18V LXT Li Ion 1 2 Hammer Drill for BL1815 BL1830 DC18RA $63.95 Time Remaining: 17d 5h 2m Buy It Now for only: $63.95 |
 Bosch 18V Li Ion Brute Tough 1 2 in Hammer Drill Driver HDH181 01 NEW $279.99 Time Remaining: 10d 15h 4m Buy It Now for only: $279.99 |
 MILWAUKEE 2604 22 M18 FUEL 18V LITHIUM ION 1 2 HAMMERDRILL KIT NEW HAMMER DRILL $76.00 (9 Bids) Time Remaining: 5d 15h 5m |
 Bosch 18V Li Ion Compact Tough 1 2 in Hammer Drill HDS181 02 NEW $200.00 Time Remaining: 24d 1h 1m Buy It Now for only: $200.00 |
 NEW HITACHI 18V WH18DL 1 4 IMPACT G18DL GRINDER 18 VOLT CORDLESS NICAD LIT ION $199.97 Time Remaining: 19d 10h 37m Buy It Now for only: $199.97 |
 HITACHI 18V 15 AH LITHIUM ION SLIDE BATTERY CORDLESS HAMMER DRILL KIT DV18DSFL $149.95 Time Remaining: 12d 19h 1m Buy It Now for only: $149.95 |
 2 HITACHI DV18DL 18 VOLT LI ION NICAD CORDLESS HAMMER DRILLS 18V HAMMERDRILL $217.97 Time Remaining: 10d 22h 44m Buy It Now for only: $217.97 |
 10X Makita BHP454 18V Li Ion 1 2 Cordless Hammer Drill $2,750.00 Time Remaining: 19d 13h 53m Buy It Now for only: $2,750.00 |
 Bosch 18V Li Ion Compact Tough 1 2 in Hammer Drill HDS180 03 NEW $229.99 Time Remaining: 6d 13h 1m Buy It Now for only: $229.99 |
 DEWALT DC927KL R 1 2 18 Volt 18V Cordless Li Ion Hammerdrill Drill Driver Kit $304.99 Time Remaining: 21d 10h 50m Buy It Now for only: $304.99 |
 Bosch 18V Li Ion Compact Tough 1 2 in Hammer Drill HDS180 02 NEW $219.99 Time Remaining: 10d 1h 1m Buy It Now for only: $219.99 |
 Makita 18V LXT Li Ion 1 2 in Hammer Drill Tool Only LXPH01Z NEW $99.00 Time Remaining: 4d 3h 12m Buy It Now for only: $99.00 |
 Bosch 18V Li Ion 1 2 Hammer Drill Tool Only 17618B NEW $166.98 Time Remaining: 8d 19h 1m Buy It Now for only: $166.98 |
 DEWALT 18V Cordless Li Ion 1 2 in Compact Hammer Drill DCD775KL NEW $239.99 Time Remaining: 10d 15h 12m Buy It Now for only: $239.99 |
 Bosch 18V Li Ion Compact Tough 1 2 in Hammer Drill HDS181 01 NEW $259.99 Time Remaining: 6d 13h 1m Buy It Now for only: $259.99 |
 Bosch 18V Li Ion Compact Tough 1 2 in Hammer Drill HDS181 03 NEW $239.99 Time Remaining: 19d 1h 1m Buy It Now for only: $239.99 |
 MILWAUKEE 18V LI ION BATTERY CHARGER NEW 48 59 1801 $15.99 Time Remaining: 6d 21h 20m |
 Bosch 18V Li Ion Compact 1 2 in Hammer Drill Tool Only HDS181B NEW $126.98 Time Remaining: 22d 1h 1m Buy It Now for only: $126.98 |
 NEW HITACHI DS18DL 18V CORDLESS DRILL2 EBM1830 LIT ION 30 AH BATTERIES 18 VOLT $267.97 Time Remaining: 19d 15h 21m Buy It Now for only: $267.97 |
 HITACHI 2 WH18DL 18 VOLT IMPACT DRIVER 2 EBM1830 LIT ION BATTERY 18V CORDLESS $359.97 Time Remaining: 10d 22h 36m Buy It Now for only: $359.97 |
 Bosch 18V Li Ion 1 2 in Hammer Drill Tool Only HDH181B NEW $176.98 Time Remaining: 13d 3h 2m Buy It Now for only: $176.98 |
 Bosch 18V Cordless Lithium Ion Brute Tough Drill Driver 37618 01 RT $186.98 Time Remaining: 10d 15h 6m Buy It Now for only: $186.98 |
 Makita 18V LXT Li Ion 1 2 in Hammer Driver Drill Kit LXPH01 NEW $279.00 Time Remaining: 27d 3h 13m Buy It Now for only: $279.00 |
 Bosch 18V Li Ion Tough 1 2 in Drill Driver Tool Only DDS181B NEW $106.98 Time Remaining: 6d 13h Buy It Now for only: $106.98 |
 Bosch 18V Li Ion 1 2 in Drill Driver Tool Only DDH181B NEW $166.98 Time Remaining: 13d 3h 1m Buy It Now for only: $166.98 |
 HITACHI DV18DL KEYLESS CORDLESS HAMMER DRILL 1 2 18V LI ION AUTHORIZED DEALER $396.10 Time Remaining: 24d 18h 7m Buy It Now for only: $396.10 |
 DEWALT 18V Cordless XRP Li Ion 1 2 Hammer Drill Kit DCD970KL NEW $329.00 Time Remaining: 1d 21h 4m Buy It Now for only: $329.00 |
 Hitachi 18V Li ion Hammer Drill EBM 1830 With Battery $200.00 Time Remaining: 17h 52m Buy It Now for only: $200.00 |
 Makita 18V LXT Lithium Ion 1 2 Hammer Drill BHP452 $299.99 Time Remaining: 9d 12h 22m Buy It Now for only: $299.99 |
 Metabo 18V Li Ion Hammer Drill $259.00 Time Remaining: 9d 16h 20m Buy It Now for only: $259.00 |
What is the atomic number of an atom that forms an ion with 18 electrons and a charge of 2+?
What is the atomic number of an atom that forms an ion with 18 electrons and a charge of 2+
A)40
B)48
C)30
D)18
The atomic number equals the number of protons in the nucleus. The number of protons equals the number of electrons in a neutral atom. In this case it will be 18 + 2 = 20 for the atomic number of the element. The number 2 is added to 18 because the +2 charge indicates that 2 electrons have been removed from the original neutral atom.
None of the answers in correct. The correct answer is 20.