Midterm oct 8

Question 1

The Plum-Pudding Model of the Atom

Answer 1

Electrons float in a
diffuse cloud of
positive charge

Question 2

what is this λ

Answer 2

wavelength

Question 3

what is an isotope

Answer 3

Atoms that have the same atomic number (Z) but different mass number (A

Question 4

what is v

Answer 4

frequency

Question 5

λxv= what

Answer 5

velocity speed of the wave ms^-1

Question 6

amplitude

Answer 6

height of the wave above or
below the midline.

Question 7

Accelerating
electrons should

Answer 7

emit energy

Question 8

An electron can pass only from one
allowed state to another by….

Answer 8

emission or
absorption of fixed discrete quantities of
energy

Question 9

Orbitals acquire more nodes as the value of…

Answer 9

n and orbital energy
increases:

Question 10

, we obtain an orbital by..

Answer 10

By specifying 3 quantum numbers in a wave
function

Question 11

wave can exist only if n=

Answer 11

1,2,3,4…

Question 12

wave can exist only if L=

Answer 12

0,1,2,3, n-1

Question 13

wave can only exist if ml =

Answer 13

-L, +L, or -L+1, -L+2… 0, 1, 2, L-1

Question 14

what is principle quantum #

Answer 14

N only a positive,
nonzero, integral value

Question 15

n determines

Answer 15

the radial distribution and thus
the average distance of the electron from the nucleus, and thus is most important in defining the energy of an electron.

Question 16

The orbital angular momentum
quantum number

Answer 16

L

Question 17

The magnetic quantum number

Answer 17

ml

Question 18

if L=3 then whats ml

Answer 18

-3, -2, -1, 0, 1, 2, 3

Question 19

◼ The first 4 subshells are:

Answer 19

l = 0, s subshell
l = 1, p subshell
l = 2, d subshell
l = 3, f subshell

Question 20

A pair of electrons have no magnetic field
(opposing spin).

Question 21

Electrons in orbitals close to the
nucleus…

Answer 21

screen or shield the nucleus
from electrons farther away.

Question 22

The ability of electrons in s orbitals to get
close to the nucleus is called…

Answer 22

penetration

Question 23

Only two electrons can occupy the same
orbital and these electrons must

Answer 23

have the
opposite spin.

Question 24

atomic size decreases

Answer 24

from left to right across a period even though we are adding more electrons

Question 25

• higher Zeff pulls outer electrons

Answer 25

closer to the nucleus

Question 26

Zeff for outer electrons

Answer 26

increases across a period:

Question 27

moving down a group:

Answer 27

outer electrons in higher n orbitals
* higher n, further from nucleus

Question 28

Overall, higher n with similar Zeff means:
* ATOMS GET BIGGER DOWN A GROUP

Question 29

for atoms of the same element cations are ____________

Answer 29

smaller

Question 30

-Na+ and Mg2+ are isoelectronic

Answer 30

(they have the same # of e-
)

Question 31

for isoelectronic cations, the more positive the ionic charge

Answer 31

the smaller
the ionic radius

Question 32

anions are __________than atoms of same element

Answer 32

bigger