TYPES OF SUBSTANCES AND CHEMICAL BONDS

Substances made up of only one type of atom

• elements

• compounds

• mixtures

• ions

What are the true facts about a compound:

• separated easily

• energy is taken in or given out during formation

• unique properties different from the elements that form it

• made up of two or more elements

Carbon dioxide is an example of:

• element

• mixture

• compound

• ion

Magnesium ribbon burns in air with a dazzling bright light and forms Magnesium oxide. What sort of a substance in MgO?

• mixture

• compound

Atoms bond to form compounds to obtain a ________ outer shell of electrons in their valence shells

The atoms of the Noble gases have a full outer shell, thus they are _________ in nature

A charged particle formed due to unequal number of protons and electrons is called:

• element

• compound

• ion

• mixture

The atom of sodium forms a positive ion by gaining one electron in the outermost shell

• TRUE

• FALSE

How does atom of Chlorine attain stable configuration in the valence shell?

• losing an electron

• gaining an electron

• losing two electrons

• sharing two electrons

Give the electronic configuration for Potassium atom with atomic number 19 - __________