For each of the following, give the name of an element from Period 2 (lithium to neon), whichmatches the description. Elements may be used once, more than once or not at all. (i) anelement which is gaseous at room temperature and pressure.......................................................................................................................................(ii) an element which forms an oxide that is a reactant in photosynthesis.......................................................................................................................................(iii) an element that is a product of photosynthesis.......................................................................................................................................(iv) an element that makes up approximately 78% by volume of the air.......................................................................................................................................(v) an element which has atoms with a full outer shell of electrons.......................................................................................................................................(vi) an element which exists as both diamond and graphite.......................................................................................................................................(vii) an element that reacts vigorously with cold water.......................................................................................................................................(viii) a soft metallic element which is stored in oil.......................................................................................................................................(b) Give the formula of a compound that contains(i) only boron and oxygen, ................................................................................................(ii) only lithium and nitrogen. ..............
Question
For each of the following, give the name of an element from Period 2 (lithium to neon), whichmatches the description. Elements may be used once, more than once or not at all. (i) anelement which is gaseous at room temperature and pressure.......................................................................................................................................(ii) an element which forms an oxide that is a reactant in photosynthesis.......................................................................................................................................(iii) an element that is a product of photosynthesis.......................................................................................................................................(iv) an element that makes up approximately 78% by volume of the air.......................................................................................................................................(v) an element which has atoms with a full outer shell of electrons.......................................................................................................................................(vi) an element which exists as both diamond and graphite.......................................................................................................................................(vii) an element that reacts vigorously with cold water.......................................................................................................................................(viii) a soft metallic element which is stored in oil.......................................................................................................................................(b) Give the formula of a compound that contains(i) only boron and oxygen, ................................................................................................(ii) only lithium and nitrogen. ..............
Solution
(i) An element which is gaseous at room temperature and pressure: Nitrogen (N) (ii) An element which forms an oxide that is a reactant in photosynthesis: Carbon (C) (iii) An element that is a product of photosynthesis: Oxygen (O) (iv) An element that makes up approximately 78% by volume of the air: Nitrogen (N) (v) An element which has atoms with a full outer shell of electrons: Neon (Ne) (vi) An element which exists as both diamond and graphite: Carbon (C) (vii) An element that reacts vigorously with cold water: Lithium (Li) (viii) A soft metallic element which is stored in oil: Lithium (Li)
(b) Give the formula of a compound that contains (i) only boron and oxygen: B2O3 (ii) only lithium and nitrogen: Li3N
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