name:______date:______period:_____
modern atomic theory ws #2
i. completion
- any orbital, regardless of type, may contain a maximum of ______electrons.
- the fact that no two electrons in the same atom can have the same set of four quantum numbers is known as ______.
- the two possibilities for electron spin are ______and ______.
- not pairing electrons within a sublevel until necessary is known as ______.
- n s2, n p5 is the characteristic outer energy level electron configuration of the group ______elements.
- in the lewis dot system, the nucleus and inner energy level electrons are represented by the ______of the element and are usually called the ______.
- the maximum number of electrons allowed in the n=4 main energy level is ______.
- the outer energy level electrons are known as ______electrons.
- there are ______possible orientations for the d orbitals.
- when all the electrons in an atom are in the lowest possible energy state, the atom is said to be in the ______.
- an orbital pair of electrons differ only in ______.
- in any p sublevel there are ______p orbitals.
- the number of orbitals in the outermost energy level of neon is ______.
- if an electron has absorbed energy and has shifted to a higher energy level, the electron is said to be ______.
- each orbital in a sublevel must contain one electron before any orbital in the sublevel can contain ______.
- the electron configuration, 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p1, is that of the element ______which contains ______valence electrons.
- if n=3, the total number of orbitals is ______, and the number of d orbitals is ______.
- a sublevel designated 4p means a p sublevel in the ______main energy level.
- the number of electrons in the kernel of chlorine is ______.
- ______attributed significant wave properties to small, fast-moving particles such as electrons.
- [Ne] is called the “______” and represents the first ______electrons in an atom.
ii. true or false
_____ 1. it is not possible to determine the path of an electron in an atom.
_____ 2. in the modern atom, bright line spectra are still accounted for through certain allowed energy transitions of electrons.
_____ 3. an orbital pair of electrons may differ in ms value.
_____ 4. a d sublevel can hold a maximum of 14 electrons.
_____ 5. in the modern atom, the electron is pictured in terms of probability.
_____ 6. some orbitals contain more than two electrons.
_____ 7. all electrons are identical.
_____ 8. an orbital is a volume in space where the electron is located ~90%+ of the time.
_____ 9. the modern atom is sometimes thought of as a small positive nucleus surrounded by a cloud of negative charge.
_____ 10. for all s electrons l and ml are both equal to zero.
_____ 11. the process of placing electrons in the lowest possible energy positions in order to obtain ground state configurations for atoms is known as “the aufbau principle”.
_____12. the wave mechanical or quantum mechanical model of the atom applies equally well to one- and multi-electron systems.
_____ 13. it is impossible to draw a reasonable likeness of an atom.
_____ 14. positive spin ( ) refers to an electron that is spinning clockwise.
_____ 15. [Xe] 5s2 is the electron configuration for Sr.
iii. periodic table cheat sheet
write the sublevel being filled between arrows, i.e. 2p, 4s, 5f, etc.
iv. more fun!!!!!
- identify the elements whose atoms have the following configurations:
- 1s2 2s2 2p3
- 1s2 2s2
- [Ne] 3s2
- [Ne] 3s2 3p3
- [Ar] 4s1
- [Ar] 3d6 4s2
- is it possible to define the exact path of an electron around a nucleus? what principle do we rely on to answer this question?
- what sublevel fills after the 6p? after the 4d? after the 6s?
- what element has the following quantum numbers?
- 4, 0, 0, -½
- 2, 1, -1, +½
- 3, 2, 0, -½
- 2, 1, +1, +½
- 3, 2, -2, -½
- 4, 1, -1, +½
- in which orbital does the electron have the greatest energy?
- 1s or 2s
- 2s or 2p
- 3s or 3d
- write quantum numbers for the following electrons
- 3s1
- 2p5
- 2p2
- 3d4
- 3d7
- 4p5
- how many electrons can be accommodated in the following:
- a d orbital
- a p sublevel
- all n=3 orbitals
- which orbitals cannot exist according to the modern atomic theory? 6h, 4g, 5h, 7j
- what are valence electrons?
- what is the lewis dot structure for iodine? how many electrons does the kernel represent?
v. complete the following table of quantum numbers for the last electron entered.
In
/ Os / Pb / Cs / Nbn / 4 / 5 / 6 / 7 / 3
l / 3 / 2 / 2 / 0 / 1
ml / +2 / +1 / -1 / 0 / +1
ms / -½ / +½ / -½ / +½ / -½