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Nature Of Matter
Test Description: Basic principles of chemistry (Section 2.1)
Instructions: Answer all questions to get your test result.
1) The three particles that make up atoms are _____.
A
positives, negatives, and neutrals
B
protons, neutrons and electrons
C
protons, neutrons, and isotopes.
D
neutrons, isotopes and electrons
2) What particles are found in a cloud surrounding the nucleus of an atom?
A
electrons
B
neutrons
C
isotopes
D
protons
3) Isotopes are atoms of the same element with the same number of protons and a different number of ___.
A
electrons
B
ions
C
neutrons
D
protons
4) What type of ion forms when an atom loses electrons?
A
neutral
B
positive
C
radioactive
D
negative
5) Scientists show the composition of compounds by a kind of shorthand known as a chemical formula.
A
true
B
false
6) If an atom contains 11 protons and 12 neutrons, its atomic number is ____.
A
11
B
1
C
23
D
45
7) If an atom contains 3 protons, 4 neutrons, and 3 electrons, its mass number is ____.
A
6
B
10
C
3
D
7
8) A covalent bond is formed as the result of ____.
A
sharing electrons
B
transferring electrons
C
transferring protons
D
sharing protons
9) Of the three subatomic particles, _____ are most involved in forming chemical bonds.
A
neutrons
B
protons
C
electrons
D
isotopes
10) Which of the following is a substance formed by the chemical joining of two or more elements in definite amounts?
A
enzyme
B
nucleus
C
compound
D
isotope
*select an answer for all questions
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