Atoms, elements and compounds

electronic structure of calcium is 2,8,8,2. What is the position of Calcium in the periodic table?

• period 4, group 4

• period 4, group 2

• period 2, group 4

• period 2, group 2

Sugar water is a

• compound

• mixture

• element

• molecule

What is the total number of electrons in one molecule of ammonia, NH3

• 8

• 9

• 10

• 11

Compound made of Na and Cl is

• metallic compound

• covalent compound

• ionic compound

Atomic number of K is 19, which statement describes the bonding in the compound formed?

• each K gives 1 electron

• each K gains 1 electron

• each K gives 2 electrons

• each K gains 2 electrons

To form an ionic compound, each chlorine atom gains 1 electron to form

• cation

• anion

• element

• compound

Where is a metal structure model?

• 
• 
• 
• 

In MgCl2 compound,

• each Mg gives 2 electrons

• each Cl gains 1 electron

• each Cl gives 1 electron

• each Mg gains 2 electrons

choose the right characteristics when talking about graphite

• can conduct electricity

• used as a lubricant

• very high melting point

• 4 bonds

Which substance is a macromolecule?

• water

• copper

• silicon oxide

• sodium chloride