1) The shortest representation of an element is known as its______________ a) valency b) mass c) symbol d) atoms 2) Nucleons consist of ________and_________ in nucleus. a) protons , electrons b) neutrons , protons c) neutrons, electrons d) no particles 3) The mass of electrons is __________grams a) 9.1 x 10-28 b) 1.6 x 10-24 c) 1.6 x 10-19 d) 1.6 x 10-28 4) Sulphur is a ______________ molecule a) triatomic b) monoatomic c) biatomic d) polyatomic 5) valency of the lithium__________ a) 0 b) 1 c) 2 d) 4 6) The symbol of calcium___________________ a) C b) Ca c) cl d) Cu 7) 2H represents two_________ of hydrogen a) molecules b) atoms c) radicals d) anions 8) The ____________of an elements is the combining capacity of an atom of the elements a) valency b) mass number c) atomic number d) none of these 9) What is the valency of OH- ________ a) 2 b) 3 c) 1 d) 4 10) Quicklime contains____________________ a) calcium and oxygen b) hydrogen and oxygen c) calcium and chlorine d) calcium and hydrogen 11) The group 8 elements with valency zero is called_____________ a) representative b) inert gases c) transition elements d) periodic elements 12) constituents elements of potassium permanganate are_________________ a) k, p and o b) k, p and s c) p, Mn and o d) k ,Mn and o 13) which of the following possess all the properties of an element________________ a) radical b) atom c) molecule d) ion 14) which of the following is a tetravalent elements________ a) A b) C c) Na d) K 15) periodic table was invented by_________________ a) Dmitri Mendeleev  b) Democritus c) john dalton d) Robert boyle

GRADE 7 CHEMISTRY 1/11/2025

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