Chemistry 51 - Fundamentals of Chemistry » Fall 2021 » Chapter 2 Homework

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Question #1
The mass number of an atom is the sum of the numbers of protons and neutrons in the nucleus.
A.   FALSE
B.   TRUE
Question #2
The electron was the first subatomic particle to be discovered, and has a mass of 9.109 × 10–31 kg.
A.   FALSE
B.   TRUE
Question #3
The orbiting electrons in an atom account for its size.
A.   TRUE
B.   FALSE
Question #4
In a neutral atom, the number of protons equal the number of electrons.
A.   FALSE
B.   TRUE
Question #5
Increasing the number of electrons in a given shell of an atom will increase the atomic radius of that atom.
A.   TRUE
B.   FALSE
Question #6
Which of the following is an element?
A.   Iron
B.   Juice
C.   Liquefied CO2
D.   Air
E.   Wood
Question #7
What is the chemical symbol for sodium?
A.   Na
B.   S
C.   Ni
D.   Su
E.   So
Question #8
What does the modern atomic theory state?
A.   All molecules are composed of atoms.
B.   All elements are composed of molecules.
C.   All elements are composed of atoms.
D.   All compounds are composed of molecules.
E.   All atoms are of the same size.
Question #9
What did Rutherford conclude about the internal structure of an atom?
A.   Protons and neutrons are present in the nucleus.
B.   Protons and electrons are concentrated in the nucleus.
C.   Electrons and neutrons are concentrated in the nucleus.
D.   Only neutrons are present in the nucleus.
E.   Only electrons are present in the nucleus.
Question #10
The relative charge of an electron, neutron and proton are:
A.   -1, 0, +1
B.   +1, -1, 0
C.   -1, +1, 0
D.   +1, 0, -1
E.   0, +1, -1
Question #11
The atomic number of an atom is equal to:
A.   the number of protons in an atom.
B.   the number of neutrons in an atom.
C.   the number of neutrons and protons in an atom.
D.   the number of electrons in an atom.
E.   the number of neutrons and electrons in an atom.
Question #12
How many electrons are present in a neutral atom of carbon? (Hint: The atomic number of carbon is 6.)
A.   18
B.   12
C.   9
D.   3
E.   6
Question #13
What are isotopes?
A.   Atoms of an element with different number of neutrons.
B.   Atoms of an element with different number of protons.
C.   Atoms of an element with different number of nuclei.
D.   Atoms of an element with different number of electrons.
E.   Atoms of an element with different atomic numbers.
Question #14
If 90% of an element 'E' exists as 21 H and 10% as 24 H , then its atomic mass would be _____?
A.   21.3 u
B.   24 u
C.   22.4 u
D.   45 u
E.   21 u
Question #15
Which of the following has the biggest atomic radius?
A.   Bromine
B.   Chlorine
C.   Argon
D.   Sulfur
E.   Phosphorus
Question #16
A(n) _______ is the smallest part of an element that maintains the identity of that element.
A.   proton
B.   Atom
C.   electon
D.   nucleus
Question #17
1s22s22p63s1 is the electronic configuration of _______.
A.   Sulfur
B.   Sodium
C.   Potassium
D.   Carbon
Question #18
Carbon has 2 core and _______ valence electrons.
A.   2
B.   8
C.   6
D.   4

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