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WorksheetsUnit 3 Review
Total questions: 17
Worksheet time: 3hrs 50mins
This scientist discovered the center of the atom was very small, dense and positivity charged
Rutherford
Thompson
Bohr
Democritus
The subatomic particle with a positive charge is
The proton
The neutron
The electron
The cork
What is equal to the number of protons plus the number of neutrons?
Mass number
Atomic number
Average atomic mass
Electron number
When an atom gains electrons it has
A negative charge
A positive charge
The atomic number of an atom tells us how many ____ it has
Protons
Electrons
Neutrons
Corks
What is found in an atom's nucleus
Protons and Neutrons
Electrons and Protons
Neutrons and Electrons
Only protons
What equipment did Thomson use to study the atom
Cathode ray tube
Gold foil and alpha particles
An atoms gets a positive charge by
Loosing electrons
Gaining Electrons
Gaining Protons
An anion has a _______ charge.
Negative
Positive
Neutral
_______ are atoms that have the same atomic number by different mass numbers.
Isotopes
Cations
Elements
Anions
An element has 2 common isotopes. The first isotope has a mass of 68.926 amu and occurs 60.10% of the time. The second isotope has a mass of 70.925 amu and occurs 39.90 % of the time. Calculate the atomic mass of this element.
69.72amu
70.2amu
68.27amu
72.12amu
Nitrogen has an atomic mass of 14.007 amu. Nitrogen has two common isotopes. One of the isotopes has a mass of 14.003 amu and a relative abundance of 99.632%
What is the mass of the other isotope?
15amu
14amu
16amu
12amu
Ag has a charge of +1, how many electrons does it have?
46
45
48
50
What is the atomic number of Sb?
51
21
34
14
For a neutral oxygen atom, how many electrons does it have?
8
16
12
10
Ir-192 has how many neutrons?
115
77
70
192
Bromine has a -1 charge, how many electrons does it have?
36
35
34
45
