Answer:
Se =[Ar] 3d¹⁰ 4s² 4p⁴
Explanation:
The noble gas notation is used for the shortest electronic configuration of other periodic table elements.
For example:
The atomic number of Argon is 18, and its electronic configuration is,
Ar₁₈ = 1s² 2s² 2p⁶ 3s² 3p⁶
The atomic number of selenium is 34, its electronic configuration is,
Se₃₄ = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁴
By using the noble gas notation, electronic configuration of selenium can be written is shortest form.
Se =[Ar] 3d¹⁰ 4s² 4p⁴
This electronic configuration is also called abbreviated electronic configuration.
Answer:
A D E hope it helps. have a great day
Answer:
a) Ionic bonding
Covalent bonding
Metallic bonding
b) Electrons with the same state must have opposite spins.
Electron state can hold no more than two electrons.
Explanation:
a) When an atom loses electrons it became a cation, with a positive charge, and when an atom gain electrons it became an anion, with a negative charge. Because of the attraction of the opposite charges, the ions form a bond, which is called ionic bonding.
When atoms share electrons to complete the octet rule, they form a molecule by covalent bonding.
When a metal loses its valence electrons, they form a "sea of electrons" and the cations are "glued" by them, which is called metallic bonding.
b) The Pauli exclusion principle determinants that two electrons can not occupy the same state at the same time, it means that two electrons can't have the same four quantic number equal. If they are at the same shell, they must have different spins. The electron can have only two spin (-1/2 or +1/2) so the electron state can hold no more than two electrons, and they have to have opposite spins.
B. Counting individuals because it is the easiest way to collect information and does not require any other people to collect
Answer:
Glucose and galactose
Explanation:
Lactose is a disaccharide consisting of a glucose and a galactose unit.
The glucose and galactose are regenerated on acid hydrolysis.