|-Identification

_________1. It is a branch of science that deals with the study of structure,composition and changes of matter undergo.
_________2.The components of an atom are collectively referred to as _______.
_________3. It describes how the electrons are distributed among the orbitals.
_________4. The principle which states that electrons fill the orbitals, one at time,
starting with the lowest energy orbital then proceeding to the one with
higher energy.
_________5. How many sublevels that the 5th energy level has?
________6. The vertical column in the periodic table is called_______.
___________7. It is defined as anything that occupies space and has mass.
8. The particle with positive charge is_______.
_________9. The particle of atom with negative charge.
__________10. The maximum number of electrons that the Af sublevel may contain is _______.

__________11 - 12. The particles that make up almost all of the mass of an atom.
________13.The total number of electrons that can fill the 2nd energy level.
_______14.The_________of an element is equal to the number of
electrons/protons have.
_______15. The state of matter that has definite shape and volume.
______16. The region in space where we can find the electrons.
______17. The lowest energy level is _____.
_______18. The vertical column in the periodic table is called _____.
______19. Group 1 is referred as ______.
______20. Group 18 is referred as _______.​