Quiz 1 second tearm prep 1 unit 1 lesson 1

1-The element, Whose atomic number is ................................forms an ionic bond with oxygen.

• a- 2

• b- 10

• c- 12

• d-16

2-Nonmetal element its nucleus contains 18 neutrons , its electrons revolve in 3 energy levels and it tends to gain one electron during chemical reactions , its mass no. equal..................................

• a-17

• b-18

• c-35

• d- 40

3-Single covalent bond can exist in.................... Molecule.

• a-hydrogen

• b-oxygen

• c-nitrogen

• d-  sodium

4-In triple covalent bond , each atom shares with …………………….

• a. one electron

• b. two electrons 

• c. three electrons

• d. three pairs of electrons

5- All the following are covalent molecules except ………………………

• a. H2O        

• b. Mg O    

• c. H Cl         

• d. O2

6- The bond in water molecule is an ionic bond .

• a- true

• b-false

7-Metals tend to lose electrons and convert into negative ions.

• a- true

• -false

8-The bond in sodium chloride is a single covalent bond.

• a- true

• b- false

9- The molecule of noble gases are diatomic molecules

• a-true

• b- false

10-In a positive ion , the number of electrons is greater than the number of protons .

• a- true

• b- false