Quiz no.1, g.8

The atom consists of ...........

• Nucleus & electrons.

• Nucleus only.

• Electrons only.

-The covalent bond in CO₂ is..............

• -Single covalent bond.

• -Double covalent bond.

• -Triple covalent bond.

-Salt solution conducts electricity because it is............

• -Ionic compound.

• -Covalent compound.

• -Metallic compound.

-Sodium is a metal which changes into..........during the chemical reaction.

• -Negative ion.

• Positive ion.

• Not form ion.

-The chemical bond between atoms of aluminum is................

• -Ionic bond.

• -Metallic bond.

• -Covalent bond.

The electrons which locate in outer most shell inside the atom are called......................

• Valence electrons.

• -Stable electrons.

• -No Correct answer.

-Salt can't conduct electricity as it's an ionic bond because it is ............

• -Solution.

• -Crystal (solid ).

• -Liquid.

-Argon locates in group 18 in the periodic table so it is .............

• -Chemically unstable.

• -Chemically stable.

• -Both.

-Magnesium (Mg) locates in 2 group in the periodic table so it has ..............

• -4 valence electrons.

• -3 valence electrons.

• -2 valence electrons.

-The chemical bond in nitrogen molecule is ...........

• -Triple covalent bond.

• -Ionic bond.

• -Metallic bond.