Chemical combination

The number of known elements up till now is ….elements

• 92
• 118
• 121
• 211

All of these elements are metal solid elements except ……

• sodium
• magnesium
• mercury
• aluminum

All of the following are properties of metals except……

• they are melleable and ductile

• they are good conductors of electricity

• they are bad conductors of heat

• they contain 1,2 or 3 electrons in outermost shell

All of the following are metals except..

• iron
• oxygen
• copper
• sodium

Oxygen is from…

• acids
• bases
• metal elements
• non-metal elements

The element which has atomic number 12 is considered from…….

• a. metals
• b. non-metals
• c. noble gases
• d. acid

When an atom of an element loses one electron or more,it changes into…..

• a. a negative ion
• b. a positive ion
• c. a neutral atom
• d. no correct answer

All of the following elements can form positive ions,except…..

Which of the following figures represents the structure of sodium ion?

• 
• 
• 
• 

The number of energy levels in sodium ion is …… the number of energy levels in its atom

• a. less than
• b. more than
• c. equal to
• d. no correct answer