Periodic Table
The maximum number of electrons in the lowest energy level?
2 electrons
Where does metallic bond exist? (which type of element)
metals
Does sodium lose or gain electrons when forming ionic bond?
lose
When an sharing electron pair is attracted to the nuclei of two atoms at the same time, what will form?
covalent bond
what is the chemical formula of water
H2O
The group that has two valence electrons?
group 2
Because it conducts electricity.
What is the name of ions with positive charges?
cation/ positive ion
the overall charge of a particle that is covalently bonded
0（neutral）
The chemical formula for 2 atoms of carbon and 4 atoms of hydrogen
C2H4
The group name that has a full outer shell
noble gases
Why the metals have high melting points?
What is the ionic bond?
The strong electrostatic attraction between a positive ion and a negative ion
The particle formed when atoms share electrons
molecule
the number of atoms of hydrogen in hydrogen gas
2
What is the name of the area between Group II and Group III?
transition metal/ transition element
Why the metal can conduct electricity?
high
What type of bond will be formed when an atom shares two electrons with another atom
double bond
The number of atoms of hydrogen in ammonia
3
Who develop the Periodic Table?
Mendeleev
The type of bond between 2 nitrogen atoms
triple bond
the total number of atoms in a molecule of carbon dioxide
3