Periodic table - 1st 20 elementsView My results(active tab) Take Question 1 The element silcon is a semi-metal or metalloid. It is used in the manufacture of silicon chips. The chemical symbol for silicon is Your answerChoice Si Se S Sm Question 2 Phosphorus is found on the sides match boxes. What is the chemical symbol of phosphorus? Your answerChoice Pt K Pb P Question 3 Potassium is an extremely reactive metal. It is soft, easy to cut and reacts violently with water. The chemical symbol of potassium is? Your answerChoice K Pb P Po Question 4 Hydrogen is the lightest of all the chemical elements. It exists as a gas at room temperature and pressure and is highly flammable. The ill-fated Hindenburg airship was filled with hydrogen gas. The chemical symbol for hydrogen is Your answerChoice Hf Hg He H Question 5 Helium is a colorless unreactive gas belonging to the noble gas family. It is the second lightest element of the Periodic table and is commonly used in part balloons. The chemical symbol for Helium is? Your answerChoice Hg Hf He H Question 6 Sulfur is yellow and is used to make sulfuric acid. The chemical symbol of sulfur is? Your answerChoice Si Se S Na Question 7 Magnesium burns brightly as used used in flares. The chemical symbol for magnesium is Your answerChoice Mo Mg Mn Md Question 8 The element carbon exists in many common forms or allotropes such as graphite and diamond. The chemical symbol for the element carbon is? Your answerChoice Ce Ca C Cs Question 9 Argon is a noble gas and is chemically unreactive. Argon is used incandescent light globes. The chemical symbol for argon is? Your answerChoice Ag Ar Am As Question 10 Lithium is an alkali metal and is found in group I of the Periodic table. It is used in lithium batteries. The chemical symbol of lithium is? Your answerChoice La Li Lr K Question 11 Beryllium is found in gemstones. The chemical symbol for the element beryllium is Your answerChoice Bi Na B Be Question 12 The element boron is found as a compound in borax and boric acid. Heat resistant glass such as Pyrex contains borosilicate glass. The chemical symbol for the element Boron is? Your answerChoice Ba Be Bi B Question 13 Nitrogen is a colorless gas that makes up about 79% of the Earth's atmosphere. Nitrogen is essential for plant growth. Rhyzobium bacteria convert atmospheric nitrogen to nitrates in legume crops. The chemical symbol for nitrogen is? Your answerChoice Na Ne N Ni Question 14 Oxygen is a colorless gas that makes up about 21% of the Earth's atmosphere. Oxygen gas will reignite a glowing splint. The chemical symbol for oxygen is? Your answerChoice Ge Os O Ne Question 15 Fluorine is highly reactive gas that belongs to the halogen group. The chemical symbol for fluorine is Your answerChoice Ne Fm F Fr Question 16 Neon is a unreactive gas that is used in neon signs. The chemical symbol for neon is Your answerChoice N Ni Ne Na Question 17 Aluminum (US spelling) or aluminium (UK spelling) is a light metal which is resistant to corrosion. It's chemical formula is Your answerChoice Ag Ac As Al Question 18 Chlorine is a light yellow gas. Chlorine compounds are used in household bleaches and to kill microbes in drinking water. The chemical symbol of chlorine is? Your answerChoice Ce Cl C Co Question 19 Calcium is a reactive metal. It is part of the compound, calcium carbonate which is found in bones, teeth and shells. The chemical symbol of calcium is Your answerChoice Cm Cu C Ca Question 20 Sodium metal is highly reactive and does not occur naturally. The chemical symbol for the element sodium is Your answerChoice N S Na Si
