essay

Excercise
How many energy levels are occupied when silicon is in its ground state?
a. 2
b. 3
c. 4
d. 8
PRACTICE QUESTIONS
How many valence electrons are present in an atom of an element withatomic number 16?
a. 2
b. 4
c. 6
d. 8
Considere de composition of the species W, X, Y and Z below. Which species is an anion?
Species
Number of protons
Number of neutrons
Number of electronsW
9
10
10
X
11
12
11
Y
12
12
12
Z
13
14
10

a. W
b. X
c. Y
d. Z
Which statement is correct for emission spectrum of the hidrogen atom?
a. The lines converge a lower energies.b. The lines are produced when electrons move from lower to higher energy levels.
c. The lines in the visible region involve electron transitions into the energy level closets to the nucleaus.
d.The line corresponding to the greatest emission of energy is in the ultraviolet region
What is the correct secuence for the processes occurring in a mass spectrometer?
A. Vaporization, ionizationacceleration deflection
B. Vaporization acceleration ionization deflection
C. ….
(a) Evidence for existence of energy levels in atoms is provided by line inspectra.
State how a line spectrum differsfrom a continuous spectrums.
(b) On the diagram below draw four lines in the visible line spectrum of hydrogen
(copiar la linea marlonnn jajjaj)
(c) Explain how the information of lines indicatesthe present of enegy levels
The diagram below (not to scale) represents some of the electron energy levels in the hydrogen atom
(lineas q tienes q copier MARLOONN)
(a) Draw an arrow on thediagram to represent the electron transition for the ionization of hydrogen. Label this arrow A.
(b) Drw an arrow on the diagram to represent the lowest energy transition in the visible emission spectrum.Label this arrow B.
7. (a) DEFINE THE TERM ISOTOPE
(b) a sample of argon exists as mixture of three isotopes
Mass number 36, relative abundance 0.337%
Mass number 38, relative abundance 0.0630%...