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Periodic Table
Metallic bonds
Ionic Bonds
Covalent Bonds
Chemical Formulas
100

The maximum number of electrons in the lowest energy level?

2 electrons

100

Where does metallic bond exist? (which type of element)

metals

100

Does sodium lose or gain electrons when forming ionic bond?

lose

100

When an sharing electron pair is attracted to the nuclei of two atoms at the same time, what will form?

covalent bond

100

what is the chemical formula of water

H2O

200

The group that has two valence electrons?

group 2

200
Why copper can be used as wires? 

Because it conducts electricity.

200

What is the name of ions with positive charges? 

cation/ positive ion

200

the overall charge of a particle that is covalently bonded

0（neutral）

200

The chemical formula for 2 atoms of carbon and 4 atoms of hydrogen

C2H4

300

The group name that has a full outer shell

noble gases

300

Why the metals have high melting points?

It takes a lot of energy to break strong metallic bonds.
300

What is the ionic bond?

The strong electrostatic attraction between a positive ion and a negative ion

300

The particle formed when atoms share electrons

molecule

300

the number of atoms of hydrogen in hydrogen gas

2

400

What is the name of the area between Group II and Group III?

transition metal/ transition element

400

Why the metal can conduct electricity?

Because there are delocalised/ free-moving electrons.
400
How does the melting point of ionic compounds?

high

400

What type of bond will be formed when an atom shares two electrons with another atom

double bond

400

The number of atoms of hydrogen in ammonia

3

500

Who develop the Periodic Table?

 Mendeleev

500
What does malleable mean?
It means the substance can be hammered into many shapes. 
500
When does the ionic compound conduct electricity? (which states? 
molten or in aqueous solution
500

The type of bond between 2 nitrogen atoms

triple bond

500

the total number of atoms in a molecule of carbon dioxide

3