Chemistry
Choose the most appropriate option from the following list of elements which fit in the description. Each option may be used only once.
[Aluminium, helium, carbon, phosphorous, sodium, potassium, argon, hydrogen]
(a) An element with variable (more than one) valency and stored in water.
(b) An element present in period 3 and group I of the periodic table.
(c) An element which is an inert gas with atomic number 2.
Periodic Table
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Answer
(a) Phosphorous [P]
(b) Sodium [Na]
(c) Helium [He]
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