Ammonium ion (NH₄⁺) is an example for

• Covalent compound

• Coordinate compound

• Ionic compound

• Metallic compound

Coordinates bonds are also called ..

• ionic bonds

• covalent bonds

• dative bonds

• metallic bonds

What is the meaning of Dative Bond?

• a covalent bond between two atoms where one of the atoms provides both electrons that form the bond.

• a covalent bond between two atoms where both of the atoms provides both electrons that form the bond.

• same with an ionic bond

• not exist

Which type of chemical bond is formed in Aluminum wire?

• Metallic

• Ionic

• Covalent

• Dative

Which of the following metal has the strongest metallic bonding?

• Sodium

• Iron

• Calcium

• Potassium

What is the basis of a metallic bond?

• The attraction of neutral metal atoms.

• The attraction between positive metal ions and interlocking electrons.

• The attraction between protons and neutrons.

• The attraction between positive metal ions and free floating electrons.

Electrons that are free to move in metals are called _________ electrons

Why do metals have high melting points?

• They don't

• All the electrons become delocalised

• The negatively charged electrons act as a glue to hold the positively charged ions together.

Why do metals conduct electricity?

• They are shiny

• The electrons are delocalised and able to move

• The electrons are held tightly within the lattice

• The electrons are shared between two metal ions

Tags

NGSS.HS-PS2-5

Why does the melting point of metals increase across period 3, from Sodium (Na) to Aluminium (AI)?

• Size of atoms gets smaller

• Increased space between the valence electrons in the "sea"

• Attraction force between nuclei and free electron increases

• Increased number of valence electrons contributed to the "sea"