WorksheetsChem Unit 2 Review
Total questions: 15
Worksheet time: 9mins
22286 Rn = 21884 Po + _____ is what type of radiation?
alpha
Beta
Gamma
positron
If an electron falls from n=5 to n=2, what color of light is produced?
Blue
Violet
Green
Yellow
Which isotope has the greatest number of protons?
Pa-238
U-240
Np-238
Pu-239
A neutral atom has the following electron configuration: 1s2 2s22p63s23p4. How many valence electrons does this atom have?
4
6
11
16
How many valence electrons does carbon have?
2
4
6
8
In which transition would a photon be emitted?
n1 to n2
n1 to n3
n2 to n6
n2 to n1
In what transition would the greatest amount of energy be released?
n=1 to n=3
n=3 to n= 1
n=1 to n=6
n=6 to n=1
Copper is classified as
a non-metal
an alkaline earth metal
a transition metal
an alkali metal
Which element has the greatest atomic radii?
O
S
Se
Te
Which element has the smallest radii
C
N
O
F
Which element has the smallest electronegativity?
Li
K
Rb
Fr
Early periodic tables were based on what property?
valence electrons
chemical properties
atomic number
ionic radius
Mendeleev predicted the properties of unknown elements. His predictions were based on what?
chemical and physical properties
electron structures
where the elements were found on Earth
the abundance of the elements
What is the molar mass of H2O?
16.00 g/mol
17.05 g/mol
18.02 g/mol
19.08 g/mol
How many moles are in 50.0 g Na?
2.17 moles
4.00 moles
6.25 moles
8.99 moles
