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WorksheetsChemistry 2nd period exam
Total questions: 25
Worksheet time: 49mins
In what differs an isotope from a pure element?
number of protons
number of electrons
number or neutrons
there is no difference
In the name iodine-131, the number means
the number of neutrons
the atomic mass
the atomic number
none above
How many neutrons are in Cr-53?
53
29
28
24
Chlorine has 2 stable isotopes; Cl-37 accounts for 24.23% of abundance, and the rest is Cl-35. What is the percent of abundance of Cl-35?
35%
24.23%
75.77%
100%
When an element experiments an alpha decay, the atomic mass
decreases by 4
increases by 4
increases by 1
stays the same
Neon occurs in three stable isotopes, Ne-20, Ne-21 and Ne-22; with abundances of 90.51%, 0.27% and 9.22% respectively. Calculate the atomic mass of Ne. Show Work
Use 4 decimals
(a)
sublevel of energy with maximum capacity of 10 electrons
s
p
d
f
in a beta decay
atomic mass stays the same and atomic number increases by one
atomic mass stays the same and atomic number decreases by one
atomic mass increases by one and atomic number stays the same
atomic mass and atomic number stay the same
If 3515 P has an alpha decay, what is the result?
3515 P
3113 Al
3516S
3917Cl
9038Sr is beta emiter. The product of its decay would be
8636 Kr
9440 Zr
9038Sr
9039 Y
Mn-56 has a half-life of 2.6h, How many mg of a 3mg sample would remain after 13h? SHOW WORK. Write your result with four decimals
(a)
How long does it take a 150mg sample of Na-25 to decay to 18.75mg if the half-life of Na-25 is 60 seconds. SHOW WORK
(a)
they represent the main level of energy of an electron
groups
families
atoms
periods
there are divided in lanthanides and actinides
metals
inner transition elements
outer transition elements
non metals
there are solids, liquids and gases, are poor conductors of electricty
metals
non metals
metalloids
noble gases
Identify the properties of metals
shiny
ductile
good conductor of electricity
gas at room temperature
Which pair of elements has similar chemical and physical properties?
Cr and Mn
Be and K
As and Sb
Cl and Ar
Select the option with only metalloids
Si, Be, Te
Sb, C, B
Te, Se, Si
B, Si, Ge
Select the option with only outer transition metals
Pd, Y, Ca
Zn, Ga, Ge
Sm, Pr, U
Ti, Au, Ag
Which group do Cl, Br and At belog to?
chalcogens
alkali earth metals
halogens
crystallogens
Which element corresponds to the following electron configuration? 1s2, 2s2, 2p3
N
C
Na
there is not enough information
Which element corresponds to the following electron configuration? [54Xe],6s24f4
Nd
Pt
Pr
Ba
Write the spdf configuration for Mn. Show work
Example: 1s2,2s2 (a) etc
write noble gas configuration for Pd. Show work
Example: [10Ne],3s2, (a) etc
Write the noble configuration for Bi. Show work
Example: [10Ne],3s2, ...etc
(a)
