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List elements by names symbol and valency?
1 Hydrogen 1 2 Helium 0 3 Lithium 1 4 Beryllium 2 5 Boron 3 6 Carbon 2, 4 7 Nitrogen 3, 5 8 Oxygen 2 9 Fluorine 1 10 Neon 0 11 Sodium 1 12 Magnesium 2 13 Aluminium 3 14 Silicon 4 15 Phosphorus 3, 5 16 Sulfur 2, 4, 6 17 Chlorine 1, 3, 5, 7 18 Argon 0 19 Potassium 1 20 Calcium 3, 5 21 Scandium 3 22 Titanium 3, 4 23 Vanadium 2, 3, 4, 5 24 Chromium 2, 3, 6 25 Manganese 2, 3, 4, 6, 7 26 Iron 2, 3 27 Cobalt 2, 3 28 Nickel 2, 3 29 Copper 1, 2 30 Zinc 2 31 Gallium 2, 3 32 Germanium 4 33 Arsenic 3, 5 34 Selenium 2, 4, 6 35 Bromine 1, 3, 5, 7 36 Krypton 0 37 Rubidium 1 38 Strontium 2 39 Yttrium 3 40 Zirconium 4 41 Niobium 3, 5 42 Molybdenum 2, 3, 4, 5, 6 43 Technetium 2, 3, 4, 6, 7 44 Ruthenium 3, 4, 6, 8 45 Rhodium 3, 4 46 Palladium 2, 4 47 Silver 1 48 Cadmium 2 49 Indium 1, 3 50 Tin 2, 4 51 Antimony 3, 5 52 Tellurium 2, 4, 6 53 Iodine 1, 3, 5, 7 54 Xenon 0 55 Caesium 1 56 Barium 2 57 Lanthanum 3 58 Cerium 3, 4 59 Praseodymium 3 60 Neodymium 3 61 Promethium 3 62 Samarium 2, 3 63 Europium 2, 3 64 Gadolinium 3 65 Terbium 3 66 Dysprosium 3 67 Holmium 3 68 Erbium 3 69 Thulium 2, 3 70 Ytterbium 2, 3 71 Lutetium 3 72 Hafnium 4 73 Tantalum 3, 5 74 Tungsten 2, 4, 5, 6 75 Rhenium 1, 4, 7 76 Osmium 2, 3, 4, 6, 8 77 Iridium 3, 4 78 Platinum 2, 4 79 Gold 1, 3 80 Mercury 1, 2 81 Thallium 1, 3 82 Lead 2, 4 83 Bismuth 3, 5 84 Polonium 2, 3, 4 85 Astatine 1, 3, 5, 7 86 Radon 0 87 Francium 1 88 Radium 2 89 Actinium 3 90 Thorium 4 91 Protactinium 4, 5 92 Uranium 3, 4, 5, 6 93 Neptunium 2, 3, 4, 5, 6 94 Plutonium 2, 3, 4, 5, 6 95 Americium 2, 3, 4, 5, 6 96 Curium 2, 3, 4 97 Berkelium 2, 3, 4 98 Californium 2, 3, 4 99 Einsteinium 2, 3 100 Fermium 2, 3 101 Mendelevium 2, 3 102 Nobelium 2, 3 103 Lawrencium 3
Give a possible set of values of the four quantum numbers for the 4s and 3d electrons in titanium?
4s: n l ml ms 4s 4 3 0 1/2 4s 4 3 0 -1/2 3d: n l ml ms 3d 3 2 -2 1/2 3d 3 2 -2 -1/2 3d 3 2 -1 1/2 3d 3 2 -1 -1/2 3d 3 2 0 1/2 3d 3 2 0 -1/2 3d 3 2 1 1/2 3d 3 2 1 -1/2 3d 3 2 2 1/2 3d 3 2 2 -1/2
What is the valence number?
Hydrogen- 1 Helium- 0 Lithium- 1 Beryllium- 2 Boron- 3 Carbon- 2, 4 Nitrogen- 3, 5 Oxygen- 2 Fluorine- 1 Neon- 0 Sodium- 1 Magnesium- 2 Aluminium- 3 Silicon- 4 Phosphorus- 3, 5 Sulfur- 2, 4, 6 Chlorine- 1, 3, 5, 7 Argon- 0 Potassium- 1 Calcium- 3, 5 Scandium- 3 Titanium- 3, 4 Vanadium- 2, 3, 4, 5 Chromium- 2, 3, 6 Manganese- 2, 3, 4, 6, 7 Iron- 2, 3 Cobalt- 2, 3 Nickel- 2, 3 Copper- 1, 2 Zinc- 2 Gallium- 2, 3 Germanium- 4 Arsenic- 3, 5 Selenium- 2, 4, 6 Bromine- 1, 3, 5, 7 Krypton- 0 Rubidium- 1 Strontium- 2 Yttrium- 3 Zirconium- 4 Niobium- 3, 5 Molybdenum- 2, 3, 4, 5, 6 Technetium- 2, 3, 4, 6, 7 Ruthenium- 3, 4, 6, 8 Rhodium- 3, 4 Palladium- 2, 4 Silver- 1 Cadmium- 2 Indium- 1, 3 Tin- 2, 4 Antimony- 3, 5 Tellurium- 2, 4, 6 Iodine- 1, 3, 5, 7 Xenon- 0 Caesium- 1 Barium- 2 Lanthanum- 3 Cerium- 3, 4 Praseodymium- 3 Neodymium- 3 Promethium- 3 Samarium- 2, 3 Europium- 2, 3 Gadolinium- 3 Terbium- 3 Dysprosium- 3 Holmium- 3 Erbium- 3 Thulium- 2, 3 Ytterbium- 2, 3 Lutetium- 3 Hafnium- 4 Tantalum- 3, 5 Tungsten- 2, 4, 5, 6 Rhenium- 1, 4, 7 Osmium- 2, 3, 4, 6, 8 Iridium- 3, 4 Platinum- 2, 4 Gold- 1, 3 Mercury- 1, 2 Thallium- 1, 3 Lead- 2, 4 Bismuth- 3, 5 Polonium- 2, 3, 4 Astatine- 1, 3, 5, 7 Radon- 0 Francium- 1 Radium- 2 Actinium- 3 Thorium- 4 Protactinium- 4, 5 Uranium- 3, 4, 5, 6 Neptunium- 2, 3, 4, 5, 6 Plutonium- 2, 3, 4, 5, 6 Americium- 2, 3, 4, 5, 6 Curium- 2, 3, 4 Berkelium- 2, 3, 4 Californium- 2, 3, 4 Einsteinium- 2, 3 Fermium- 2, 3 Mendelevium- 2, 3 Nobelium- 2, 3 Lawrencium- 3
Oxidation state of nitrogen?
-3, -2, -1, 0, 1, 2, 3, 4 and 5 oxidation states
What is the oxidation number of nitrogen in HCN?
C=4 n= -3 oxygen is -2 OCN has net charge of -1 so here is my expalnation we will take C as unknown -2+x-3=-1 x=4 now N is the unknown : -2+4+x=-1 x=-3 and Oxygen is always -2 except peroxides and others cases... hope i helped !
How many different combinations can you make with 2 4s 1 3 and 1 2?
1 1 1 2 1 3 1 4 2 1 2 2 2 3 2 4 3 1 3 2 3 3 3 4 4 1 4 2 4 3 4 4
How do you get the answer 7 using only numbers -4-3-2-1?
[(-4) + (-3)]*[(-2 - (-1)] = (-4 -3)*(-2 + 1) = -7*-1 = +7[(-4) + (-3)]*[(-2 - (-1)] = (-4 -3)*(-2 + 1) = -7*-1 = +7[(-4) + (-3)]*[(-2 - (-1)] = (-4 -3)*(-2 + 1) = -7*-1 = +7[(-4) + (-3)]*[(-2 - (-1)] = (-4 -3)*(-2 + 1) = -7*-1 = +7
What is the subset of set A12345?
There are 64 subsets, and they are:{}, {A}, {1}, {2}, {3}, {4}, {5}, {A,1}, {A,2}, {A,3}, {A,4}, {A,5}, {1,2}, {1,3}, {1,4}, {1,5}, {2,3}, {2,4}, {2,5}, {3,4}, {3, 5}, {4,5}, {A, 1, 2}, {A, 1, 3}, {A, 1, 4}, {A, 1, 5}, {A, 2, 3}, {A, 2, 4}, {A, 2, 5}, {A, 3, 4}, {A, 3, 5}, {A, 4, 5}, {1, 2, 3}, {1, 2, 4}, {1, 2, 5}, {1, 3, 4}, {1, 3, 5}, {1, 4, 5}, {2, 3, 4}, {2, 3, 5}, {2, 4, 5}, {3, 4, 5}, {A, 1, 2, 3}, {A, 1, 2, 4}, {A, 1, 2, 5}, {A, 1, 3, 4}, {A, 1, 3, 5}, {A, 1, 4, 5}, {A, 2, 3, 4}, {A, 2, 3, 5}, {A, 2, 4, 5}, {A, 3, 4, 5}, {1, 2, 3, 4}, {1, 2, 3, 5}, {1, 2, 4, 5}, {1, 3, 4, 5}, {2, 3, 4, 5}, {A, 1, 2, 3, 4}, {A, 1, 2, 3, 5}, {A, 1, 2, 4, 5}, {A, 1, 3, 4, 5}, {A, 2, 3, 4, 5}, {1, 2, 3, 4, 5} {A, 1, 2, 3,,4, 5} .
What is -2 wholes 3 over 4 minus 1 over 4?
-2 3/4 - 1/4 = -(2 3/4 + 1/4) = -[2 (3+1)/4] = -(2 4/4) = -(2 + 1) = -3 or -2 3/4 - 1/4 = - (4*2 + 3)/4 - 1/4 = -11/4 - 1/4 = (-11 - 1)/4 = -12/4 = -3
How many halfs in 3 quarters?
one and a half 1/2 = 2/4 half of 2/4 = 1/4 2/4 + 1/4 = 3/4 ------------------------------------------- 3/4 ÷ 1/2 = 3/4 × 2/1 = (3×2)/(4×1) = 6/4 = 3/2 = 1½
4-3-3 2-1-4 3-2-1 1-2-4 2-2-4 4-4-5 O 2-3-65-1-3 1-3-2 6-2-5 1-4-3 Z C 4-2-2 3-3-2 2-3-3 4-3-7?
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What is 1 and 1 over 4 subtracted by 3 over 4?
1 1/4 - 3/4 = (1×4+1)/4 - 3/4 = 5/4 - 3/4 = (5-3)/4 = 2/4 = (1×2)/(2×2) = 1/2
What are the answers to the only use one two three four to get 1 to 100?
1=1 2=2 3=3 4=4 5=4+1 6=4+2 7=4+3 8=4+4 9=4+4+1 or 3+3+3 10=1+2+3+4 now 11 of course is 10 + 1 so 11=1+2+3+4+1 12 is =1+2+3+4+2 13=1+2+3+4+3 and so on 20=2*(1+2+3+4) 21 =(2*(1+2+3+4))+1 and so on and 100=(1+2+3+4)*(1+2+3+4)
What is 3 sixths minus 1 quarter?
3/6 x 2/2 = 6/12 1/4 x 3/3 = 3/12 6/12 - 3/12 = 3/12 = 1/4 Answer: 1 quarter ------------------------------------- 3/6 - 1/4 = (1×3)/(2×3) - 1/4 = 1/2 - 1/4 = (1×2)/(2×2) - 1/4 = 2/4 - 1/4 = 1/4
What is 3 and 3 4ths - 1 and 1 4ths equal?
3 3/4 - 1 1/4 = 2 2/4 = 2 1/2 15 / 4 - 5/ 4 = 10/ 4 = 2 2/ 4 = 2 1/2
Is this true 2 over 2 plus 3 4?
2/2 + 3/4 = 4/4 + 3/4= 7/4= 1 3/4 or 2/2= 1 +3/4= 1 3/4
What is 3-4 plus 1-2 plus 1-2?
Assuming 3 -4 means 3/4 , etc : The answer is 13/4 since(1/2) + (1/2) = 1 and(3/4) + [ (1/2)+(1/2) ] = 1 3/4
