How many protons arin thnucleus of a phosphorus atom?
A) 5
B) 7
C) 10
D) 15
E) 30
Correct Answer:
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Q19: According to nutritional evidences, thhuman body requires
Q20: In an atom, _ spin arounthnucleus.
A)electrons
B)protons
C)neutrons
D)both neutrons
Q21: How many types of chemical bonds arfounwithin
Q23: Which of thfollowing statements is (are) TRUabout
Q25: Electrons arsharein bonds called
A)covalent bonds.
B)ionic bonds.
C)polar bonds.
D)nonpolar
Q26: Phosphorus has _ vacancies.
A)1
B)2
C)3
D)5
E)8
Q27: Tracer isotopes
A) are used only in plants.
B)
Q27: An atothat carries a chargis callea(n)
A)ion.
B)molecule.
C)compound.
D)element.
E)microelement.
Q28: Which of thfollowing statements is NOT true?
A)All
Q29: Which chemical bonds arfounwithin water molecules?
A)hydrogen
B)ionic
C)covalent
D)inert
E)single
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