Here is my list of all 300 elements.
I have sorted the list as it is in the app, and broken it into groups of 4, so you can go through your list ingame and just compare the first in each row to the first of each group in the list, if they dont match one is missing in the previous group
1UP = life + mushroom
Air
Airplane = metal + bird
Alcohol = fire + water
Alcoholic = man + alcohol
Algae = life + water
Aluminum = airplane + metal
Arable = earth + tool
Arms = metal + tool
Ash = fire + tree
Ashtray = ash + glass
Assassin = man + poisoned weapons
Avian Flu = flu + bird
Bacon = fire + pig
Bacteria = life + swamp
Bar = brick house + beer
Barbecue = fire + meat
Bat = bird + vampire
Batman = man + bat
Beach = water + sand
Bear = beast + forest
Beast = earth + lizard
Beaver = dam + beast
Beer = alcohol + wheat
Beetle = earth + worm
Berry = grass + fruit
Bicycle = wheel + wheel
Bird = air + egg
Bitumen = kerogen + pressure
Blood = beast + hunter
Boat = water + wood
Boiler = metal + steam
Book = feather + paper
Bow = Robin Hood + arms
Bread = dough + fire
Brick = clay + fire
Brick House = brick + concrete
Butterfly = air + worm
Cactus = desert + tree
Cancer = man + cigarettes
Car = cart + combustion engine
Caramel = sugar + fire
Carbon Dioxide = oxygen + man
Carmine = cochineal + fire
Cart = wheel + wood
Cat = mouse + hunter
Caviar = fish + fish
Cement = clay + limestone
Cemetery = grave + grave
Ceramics = clay + man
Champagne = wine + soda water
Chariot = warrior + cart
Cheese = quark (cheese) + fire
Chicken = egg + life
Christmas tree = tree + light bulb
Cigarettes = paper + tobacco
City + City = country
City = skyscraper + skyscraper
Clay = sand + swamp
Cloth = tool + wool
Clothing = cloth + man
Cloud = air + steam
Coal = fire + tree
Coca-Cola = soda water + carmine
Cochineal = cactus + beetle
Coffin = corpse + wood
Combustion Engine = steam engine + gasoline
Concrete = cement + water
Continent = Country + Country
Corpse = fire + man
Dam = brick + water
Desert = sand + sand
Diamond = uncut diamond + tool
Diet = man + yogurt
Dinosaur = earth + egg
Dough = flour + water
Dragon = fire + flying dinosaur
Dust = air + earth
Earth
Ectoplasm = ghost + energy
Egg = life + stone
Electric eel = snake + electricity
Electric ray = fish + electricity
Electricity = energy + metal
Energy = air + fire
Explosion = gasoline + fire
Faberge egg = egg + diamond
Farmer = man + seed
Fat = man + pig
Feather = bird + hunter
Fern = moss + swamp
Fire
Fire Elemental = fire + life
Firearms = arms + gunpowder
Firefighter = hero + fire
Firefly = light + beetle
Fish = bacteria + plankton
Fisherman = hunter + fish
Flour = stone + wheat
Flower = water + seed
Flu = air + bacteria
Flying Dinosaur = air + dinosaur
Fondue = cheese + fire
Forest = grove + grove
Fossil = dinosaur + earth
Frankenstein = corpse + electricity
Frog = lizard + swamp
Fruit = tree + farmer
Fugu = Poison + Fish
Gasoline = petroleum + pressure
Genie8 = lamp + ghost
Geyser = steam + earth
Ghost = ash + life
Ghostbusters = scienceist + ectoplasma
Glass = fire + sand
Golem = clay + life
Grape = earth + wood
Grass = earth + moss
Grave = earth + corpse
Grove = tree + tree
Gunpowder = dust + fire
Hen Coop = chicken + hut
Hero = dragon + warrior
Hospital = brick house + sick
Hourglass = glass + sand
Hunter = arms + man
Hut = man + stone
Hydrogen = water + electricity
Ice = water + glass
Idea = man + light bulb
Iodine = algae + fire
Jedi = Light Saber + Warrior
Juice = Grapes + pressure
Kama Sutra = book + sex
Kerogen = fossil + pressure
Knife = meat + tool
Lamp = fire + glass
Lance Armstrong = bike + cancer
Lava = earth + fire
Lava Golem = lava + life
Lava Lamp = lava + lamp
Lawn mower = grass + tool
Leech = blood + worm
Library = book + book
Lichen = mushroom + algae
Life = energy + swamp
Light = electricity + light bulb
Light bulb = electricity + glass
Light saber = arms + light
Lighthouse = skyscraper + light
Lightning Rod = thunderstorm + metal
Lime = fire + limestone
Limestone = shells + stone
Livestock = beast + man
Lizard = snake + worm
Locomotive = cart + steam engine
Man = beast + life
Manure = grass + livestock
Mario = 1UP + man
McDonald’s = Coca-Cola + sandwich
Meat = beast + hunter
Mentos = Coca-Cola + geyser
Metal = fire + stone
Metal Golem = life + metal
Milk = livestock + man
Mirror = aluminum + glass
Mite = life + dust
Mold = mushroom + mud
Molotov cocktail = fire + alcohol
Moon = sun + mirror
Moss = swamp + algae
Motorboat = boat + combustion engine
Motorcycle = bicycle + combustion engine
Mouse = cheese + beast
Mud = dust + water
Mummy = corpse + paper
Museum = brick house + fossil
Mushroom = earth + algae
Obesity = man + McDonald’s
Old man = time + man
Omelette = egg + fire
Oxygen = water + electricity
Oxyhydrogen = oxygen + hydrogen
Ozone = oxygen + electricity
Panda = tree + beast
Paper = reed + tool
Pearl = sand + shells
Peat = swamp + tree
Penicillin = mold + scientist
Perfume = flower + alcohol
Petri Dish = glass + bacteria
Petroleum = bitumen + pressure
Phoenix = bird + fire
Piesiosauria = dinosaur + water
Pig = livestock + mud
Pillow = feather + cloth
Pinocchio = wood + life
Pizza = cheese + dough
Plankton = bacteria + water
Poison = mushroom + tool
Poisoned Weapons = arms + poison
Pressure = earth + earth
Prisoner = assassin + time
Quark = soured milk + fire
Quetzalcoatl = snake + bird
Reed = grass + swamp
Robin Hood = forest + hero
Rust = water + metal
Sailboat = boat + cloth
Sailing ship = cloth + wooden ship
Sailor = boat + man
Salamander = fire + lizard
Saltpeter = limestone + manure
Sand = stone + water
Sandstorm = storm + sand
Sandwich = meat + bread
Santa clause = old man + Christmas tree
Scarab = beetle + manure
Scientist = library + man
Scissors = knife + knife
Scorpion = beetle + sand
Scotch whiskey = alcohol + peat
Seed = life + sand
Sex = man + man
Sex in the City = Sex + City
Shells = plankton + stone
Sick = man + flu
Silicon = pressured +s and
Silver = moon + metal
Sith = Jedi + Assassin
Sky = air + cloud
Skyscraper = brick house + glass
Smoke = fire + tobacco
Snail = shells + worm
Snake = swamp + worm
Sniper = assassin + firearms
Soap = ash + fat
Soda water = carbon dioxide + water
Soldier = firearms + man
Soured milk = milk + yogurt
Spinning wheel = wheel + wool
Stake = wood + knife
Star = sun + scientist
Star Wars = Sith + Jedi
Steam = air + water
Steam engine = boiler + coal
Steamer = steam engine + wooden ship
Stone = air + lava
Storm = air + energy
Sugar = lime + reed
Sulfur = bacteria + swamp
Sun = sky + chariot
Sunflower = Sun + Flower
Sushi = fish + algae
Swamp = earth + water
Sweater = yarn + tool
Swine flu = pig + flu
Team = beast + cart
Tequila = alcohol + worm
The Beatles = beetle + man
Thunderbird = bird + storm
Thunderstorm = storm + electricity
Time = life + hourglass
Toast = fire + bread
Tobacco = fire + grass
Tool = man + metal
Totora = forest + ghost
Tractor = lawn mower + arable
Tree = earth + seed
Turtle = egg + sand
Twilight saga = vampire + werewolf
Typhoon = storm + water
Uncut diamond = coal + pressure
Undead = zombie + corpse
Vampire = blood + man
Vinegar = alcohol + oxygen
Vodka = alcohol + water
Volcano = lava + pressure
Vulture = corpse + bird
VW beetle = car + beetle
Walking tree = life + tree
Warrior = arms + hunter
Water
Weevil = flour + beetle
Werewolf = beast + vampire
Whale = beast + water
Wheat = arable + seed
Wheel = tool + wood
Whey = soured milk + fire
Wind = air + air
Wine = grape + alcohol
Wood = tool + tree
Wooden ship = boat + wood
Wool = beast + hunter
Worm = earth + plankton
Yarn = spinning wheel + wool
Yogurt = bacteria + milk
Yoshi = 1up + egg
Zombie = fossil + life
Zoo = beast + museum