WorksheetsReview For Test 8/29
Total questions: 17
Worksheet time: 9mins
Name
Class
Date
1.
An atom has an atomic number of 17 and a mass number of 35. How many neutrons does it have?
a)
18
b)
35
c)
34
d)
17
2.
Which subatomic particle determines the identity of an element?
a)
Proton
b)
Neutron
c)
Photon
d)
Electron
3.
An atom has 15 protons and 16 neutrons. What is its atomic number?
a)
15
b)
14
c)
16
d)
31
4.
How many electrons are there in a cation with an atomic number of 12 and a charge of +2?
a)
10
b)
12
c)
2
d)
14
5.
How many significant figures are in the measurement 4.5 X 10^?
a)
3
b)
4
c)
2
d)
1
6.
Which of the following numbers has four significant figures?
a)
0.1234
b)
1.230
c)
0.0123
d)
123,000
7.
An element has two isotopes. Isotope A has an atomic mass of 10 u and an abundance of 70%, while Isotope B has an atomic mass of 11 u and an abundance of 30%. What is the average atomic mass of the element?
a)
10.3 u
b)
11 u
c)
10.7 u
d)
10.5 u
8.
Chlorine has two main isotopes: Chlorine-35 with an atomic mass of 34.97 u and 75.78% abundance, and Chlorine-37 with an atomic mass of 36.97 u and 24.22% abundance. What is the average atomic mass of chlorine?
a)
35.45 u
b)
35.97 u
c)
34.97 u
d)
36.45 u
9.
Gallium consists of two isotopes: Ga-69 with an atomic mass of 68.93 u and 60.11% abundance, and Ga-71 with an atomic mass of 70.92 u and 39.89% abundance. What is the average atomic mass of gallium?
a)
69.72 u
b)
70.50 u
c)
70.00 u
d)
69.10 u
10.
Neon has three stable isotopes: Ne-20 with an atomic mass of 19.99 u and 90.48% abundance, Ne-21 with an atomic mass of 20.99 u and 0.27% abundance, and Ne-22 with an atomic mass of 21.99 u and 9.25% abundance. What is the average atomic mass of neon?
a)
20.18 u
b)
21.00 u
c)
20.50 u
d)
20.10 u
11.
In the Bohr model, what happens when an electron absorbs energy?
a)
It jumps to a higher energy level
b)
It is ejected from the atom
c)
It moves closer to the nucleus
d)
It loses energy and falls to a lower level
12.
How many valence electrons does a carbon atom have?
a)
4
b)
2
c)
6
d)
8
13.
What is the number of valence electrons in an oxygen atom?
a)
6
b)
7
c)
4
d)
5
14.
What does a carbon atom with a +2 charge indicate?
a)
It has lost two electrons.
b)
It has gained two protons.
c)
It has lost two neutrons.
d)
It has gained two electrons.
15.
In a +2 oxidation state, how many valence electrons does a carbon atom have?
a)
2 valence electrons
b)
4 valence electrons
c)
6 valence electrons
d)
0 valence electrons
16.
How many total electrons does an oxygen atom with a -2 charge have?
a)
10 electrons
b)
8 electrons
c)
7 electrons
d)
9 electrons
17.
What is the atomic number of oxygen?
a)
8
b)
6
c)
16
d)
12
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