Question

please help! thank you :)

one of the wavelengths of light emitted by hydrogen atoms is 656 nm, calculate the energy of a photon

a. 4.57 x 10^14J
b. 1.01 x 10^-27j
c. 1.99 x 10^-25J
d. 3.03 x 10^-19j

Given the noble gas electron configuration below, identify the atom - [Kr] 5s^2 4d^2
a. Sn
B. Sr
c. Se
d. Mo
e. Zr

what is the atom represented by the electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^4
a. Cr
b.Mo
c.O
D.S
E.Se

Answer 1

also, if you don't mind i have a few more,
which of the following orbitals does not exist?
A. 7s
B. 2d
C.4f
D.3p

What is the noble gas electron configuration for Beryillium?
A. [he] 2s^2
B.[Li] 2s^2
C. [Li] 2s^1
D. [He] 2s^1

Which color of light has a higher frequency?
Red 780nm
yellow 580nm
blue 450nm
green 530

Which of the following electron configurations represents a stable element?
A. Na - 1s^2 2s^2 2p^6 3s^1
B. Cl - 1s^2 2s^2 2p^6 3s^2 3p^5
C. Ne - 1s^2 2s^2 2p^6
D. Li - 1s^2 2s^1

Determine the Electron configuration that corresponds to an atom in an excited state.
A. 1s^2 2s^2 2p^6 3s^1
B. 1s^2 2s^2 2p^4
C.1s^2 2s^2 2p^5 3s^2
D.1s^2 2s^2 2p^6

which of the type of high energy electromagnetic radiation are likely to damage living organisms?
Radio
Infrared
Visible
Gamma


please help, just a review, i really need to pass :) thank you ! :)

Answer 2

E=hv Energy of a photon in joules= Planck's constant*freequency
v=c/lambda frequency= speed of light/wavelength

E (photon)= 6.63*10^-34 J-s *v
v= 3.00*10^17 nm/ 656 nm

Solve for v in the second equation and plug it into the second equation to determine energy.

Answer 3

As for the orbital questions, this is a concept you'll have to become familiar with (using a periodic table).

E. Zr
A. Cr
B. 2d
A. [He] 2s^2

Answer 4

I think you should be able to solve the rest yourself. Try watching a short video on youtube on orbitals in order to understand it well.

Answer 5

Also, since it's not related to orbitals, I'll just tell you that it's gamma radiation.

Answer 6

i honestly do not understand any of this, please just help me out, chemistry makes my head hurt

Answer 7

i got D for the first question, i have no idea how to answer the rest

Answer 8

is that right? anyone? please?